Solve for m: 150 + 75m + m/8 - m/3 = (900 - 5m/2)/12

Linear Equations with Mixed Fractions

150+75m+m8m3=(9005m2)112 150+75m+\frac{m}{8}-\frac{m}{3}=(900-\frac{5m}{2})\cdot\frac{1}{12}

m=? m=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:11 Open parentheses properly, multiply by each factor
00:27 We want to isolate the unknown M
00:42 We'll arrange the equation so that one side has only the unknown M
01:11 Multiply denominators to find a common denominator
01:24 Collect terms
01:31 Simplify what's possible
01:36 Isolate the unknown M
01:44 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

150+75m+m8m3=(9005m2)112 150+75m+\frac{m}{8}-\frac{m}{3}=(900-\frac{5m}{2})\cdot\frac{1}{12}

m=? m=\text{?}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify the right-hand side.
  • Step 2: Work with fractions on the left-hand side.
  • Step 3: Solve for m m .

Let's work through each step:

Step 1: Simplify the right-hand side.
The right side of the equation is (9005m2)112 \left( 900 - \frac{5m}{2} \right) \cdot \frac{1}{12} . Distribute 112\frac{1}{12} across the terms inside the parentheses:

=9001125m2112 = 900 \cdot \frac{1}{12} - \frac{5m}{2} \cdot \frac{1}{12}

=900125m24 = \frac{900}{12} - \frac{5m}{24}

=755m24 = 75 - \frac{5m}{24}

So, the simplified equation becomes:

150+75m+m8m3=755m24 150 + 75m + \frac{m}{8} - \frac{m}{3} = 75 - \frac{5m}{24}

Step 2: Combine and simplify terms.
We will first find a common denominator for the fractions on the left side. The least common multiple of the denominators 8, 3, and 24 is 24. Convert each fraction to have this common denominator:

m8=3m24\frac{m}{8} = \frac{3m}{24} and m3=8m24\frac{m}{3} = \frac{8m}{24}.

Rewrite the left-hand side:

150+75m+3m248m24150 + 75m + \frac{3m}{24} - \frac{8m}{24}

Combine the like terms:

150+75m+(3m248m24)150 + 75m + \left(\frac{3m}{24} - \frac{8m}{24}\right)

=150+75m5m24= 150 + 75m - \frac{5m}{24}

The equation becomes:

150+75m5m24=755m24150 + 75m - \frac{5m}{24} = 75 - \frac{5m}{24}

Now add 5m24\frac{5m}{24} to both sides to eliminate the fraction:

150+75m=75150 + 75m = 75

Step 3: Solve for m m .
Subtract 150 from both sides:

75m=7515075m = 75 - 150

75m=7575m = -75

Divide both sides by 75:

m=1m = -1

Therefore, the solution to the problem is m=1 m = -1 .

3

Final Answer

1 -1

Key Points to Remember

Essential concepts to master this topic
  • Distribution Rule: Apply operations inside parentheses to all terms carefully
  • Common Denominators: Convert m8=3m24 \frac{m}{8} = \frac{3m}{24} and m3=8m24 \frac{m}{3} = \frac{8m}{24}
  • Verification Check: Substitute m = -1: 150 + 75(-1) = 75 matches right side ✓

Common Mistakes

Avoid these frequent errors
  • Not distributing multiplication across all terms in parentheses
    Don't multiply (9005m2)112 (900 - \frac{5m}{2}) \cdot \frac{1}{12} by only applying 112 \frac{1}{12} to the first term = incomplete simplification! This leaves part of the expression unchanged and creates wrong equations. Always distribute multiplication to every single term inside the parentheses.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( 3x=18 \)

FAQ

Everything you need to know about this question

Why do I need to find a common denominator for the fractions on the left side?

+

Finding a common denominator lets you combine like terms easily! When you have m8m3 \frac{m}{8} - \frac{m}{3} , you can't subtract directly. Converting to 3m248m24=5m24 \frac{3m}{24} - \frac{8m}{24} = -\frac{5m}{24} makes the math much cleaner.

How do I distribute the fraction multiplication correctly?

+

When you see (9005m2)112 (900 - \frac{5m}{2}) \cdot \frac{1}{12} , multiply each term inside the parentheses by 112 \frac{1}{12} . So: 9001125m2112 900 \cdot \frac{1}{12} - \frac{5m}{2} \cdot \frac{1}{12} .

What's the easiest way to work with multiple fractions?

+

Find the LCD first! In this problem, the denominators are 8, 3, and 24. Since 24 is divisible by both 8 and 3, use 24 as your common denominator for all fractions.

Why does the fraction term cancel out on both sides?

+

After simplifying, you get 5m24 -\frac{5m}{24} on both sides of the equation. When you add the same term to both sides, they cancel out completely, leaving you with a simpler equation to solve.

How can I check if m = -1 is really correct?

+

Substitute m = -1 into the original equation:

  • Left: 150 + 75(-1) + (-1)/8 - (-1)/3 = 75
  • Right: (900 - 5(-1)/2)/12 = 75
  • Both sides equal 75, so m = -1 is correct! ✓

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