Solve for X: 11.8 + (3/8)x + 6.4 = -(6/24)x - 1.5

Linear Equations with Mixed Decimal-Fraction Terms

Solve for X:

11.8+38x+6.4=624x1.5 11.8+\frac{3}{8}x+6.4=-\frac{6}{24}x-1.5

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:05 Collect like terms
00:20 Arrange the equation so that X is isolated on one side
00:53 Collect like terms
01:10 Multiply by 3 to get the common denominator (24)
01:26 Collect like terms
01:42 Simplify as much as possible
01:54 Isolate X by multiplying by the reciprocal
02:14 This is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X:

11.8+38x+6.4=624x1.5 11.8+\frac{3}{8}x+6.4=-\frac{6}{24}x-1.5

2

Step-by-step solution

To solve the given linear equation, we will follow these steps:

  • Simplify fractions in the equation.
  • Combine like terms on each side of the equation.
  • Move all terms involving x x to one side of the equation.
  • Move constant terms to the opposite side of the equation.
  • Isolate x x to find the solution.

Let's begin by simplifying the fractions and combining like terms:

The original equation is:
11.8+38x+6.4=624x1.5 11.8 + \frac{3}{8}x + 6.4 = -\frac{6}{24}x - 1.5

First, simplify 624-\frac{6}{24} as 14-\frac{1}{4}, because 624-\frac{6}{24} is equivalent to 14-\frac{1}{4}.

So, the equation becomes:
11.8+38x+6.4=14x1.5 11.8 + \frac{3}{8}x + 6.4 = -\frac{1}{4}x - 1.5

Combine the constant terms on the left side:
11.8+6.4=18.2 11.8 + 6.4 = 18.2

The equation now is:
18.2+38x=14x1.5 18.2 + \frac{3}{8}x = -\frac{1}{4}x - 1.5

To collect all x x terms on one side, add 14x\frac{1}{4}x to both sides:
18.2+38x+14x=1.5 18.2 + \frac{3}{8}x + \frac{1}{4}x = -1.5

Convert 14\frac{1}{4} to 28\frac{2}{8} so that both fractions have a common denominator:
38x+28x=58x \frac{3}{8}x + \frac{2}{8}x = \frac{5}{8}x

Substituting back, we have:
18.2+58x=1.5 18.2 + \frac{5}{8}x = -1.5

Subtract 18.2 from both sides to isolate the term with x x :
58x=1.518.2 \frac{5}{8}x = -1.5 - 18.2

Calculate the right side:
1.518.2=19.7 -1.5 - 18.2 = -19.7

So, the equation becomes:
58x=19.7 \frac{5}{8}x = -19.7

To solve for x x , multiply both sides by 85\frac{8}{5} (the reciprocal of 58\frac{5}{8}):
x=19.7×85 x = -19.7 \times \frac{8}{5}

Calculate 19.7×85-19.7 \times \frac{8}{5}:
x=19.7×1.6=31.52 x = -19.7 \times 1.6 = -31.52

Thus, the solution to the equation is x=31.52 x = -31.52 .

3

Final Answer

31.52 -31.52

Key Points to Remember

Essential concepts to master this topic
  • Simplify First: Reduce fractions like 624=14 -\frac{6}{24} = -\frac{1}{4} before solving
  • Common Denominators: Convert 14 \frac{1}{4} to 28 \frac{2}{8} to add with 38 \frac{3}{8}
  • Verification: Substitute x=31.52 x = -31.52 back: both sides equal 9.39 -9.39

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify fractions before combining
    Don't leave 624 -\frac{6}{24} as is when combining with other fractions = confusing denominators and wrong calculations! This makes finding common denominators much harder. Always reduce fractions to lowest terms first, like 624=14 -\frac{6}{24} = -\frac{1}{4} .

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( x - 3 + 5 = 8 - 2 \)

FAQ

Everything you need to know about this question

Why do I need to simplify -6/24 to -1/4 first?

+

Simplifying fractions makes everything easier! 624=14 -\frac{6}{24} = -\frac{1}{4} is much simpler to work with. It also helps you spot common denominators more quickly when combining terms.

How do I add fractions with different denominators like 3/8 and 1/4?

+

Find a common denominator! Since 8 is a multiple of 4, convert 14 \frac{1}{4} to 28 \frac{2}{8} . Then: 38+28=58 \frac{3}{8} + \frac{2}{8} = \frac{5}{8}

Should I convert fractions to decimals instead?

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You can, but it's often messier! 38=0.375 \frac{3}{8} = 0.375 and 14=0.25 \frac{1}{4} = 0.25 create more decimal places. Working with fractions keeps calculations exact until the final step.

What's the easiest way to multiply by 8/5 at the end?

+

Think of it as: 19.7×85=19.7×1.6 -19.7 \times \frac{8}{5} = -19.7 \times 1.6 . Since 85=1.6 \frac{8}{5} = 1.6 , you can multiply -19.7 × 1.6 = -31.52 using regular decimal multiplication.

How can I check if x = -31.52 is correct?

+

Substitute back into the original equation:

  • Left side: 11.8+38(31.52)+6.4=9.39 11.8 + \frac{3}{8}(-31.52) + 6.4 = -9.39
  • Right side: 14(31.52)1.5=9.39 -\frac{1}{4}(-31.52) - 1.5 = -9.39
  • Both sides equal -9.39, so it's correct! ✓

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