Solve for X in 22x - 1/2 + 16½ = 14.5x - 12: Mixed Number Linear Equation

Linear Equations with Mixed Number Constants

Solve for X:

22x12+1612=14.5x12 22x-\frac{1}{2}+16\frac{1}{2}=14.5x-12

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to isolate the unknown X
00:07 Collect like terms
00:20 Arrange the equation so that one side has only the unknown X
00:30 Simplify what we can
00:47 Isolate the unknown X, and calculate
01:06 Collect like terms
01:27 Continue to isolate the unknown X
01:34 Simplify what we can
01:39 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

Solve for X:

22x12+1612=14.5x12 22x-\frac{1}{2}+16\frac{1}{2}=14.5x-12

2

Step-by-step solution

To solve the equation 22x12+1612=14.5x12 22x - \frac{1}{2} + 16\frac{1}{2} = 14.5x - 12 , we will follow these steps:
1. Combine like terms on both sides of the equation.
2. Isolate the variable x x .
3. Solve for x x .

Let's start by simplifying each side:

  • Simplify the left-hand side: 22x12+1612 22x - \frac{1}{2} + 16\frac{1}{2} .

The term 1612 16\frac{1}{2} is equivalent to 16.5 16.5 , so the left-hand side becomes:
22x0.5+16.5=22x+16 22x - 0.5 + 16.5 = 22x + 16.

  • Now simplify the right-hand side: 14.5x12 14.5x - 12 .

The right-hand side remains as 14.5x12 14.5x - 12 .

Now, let's collect like terms. Move the term involving x x from the right-hand side to the left:

  • Subtract 14.5x 14.5x from both sides:
    22x+1614.5x=12 22x + 16 - 14.5x = -12

This simplifies to:
7.5x+16=12 7.5x + 16 = -12 .

Next, isolate the constant term. Subtract 16 from both sides:

  • 7.5x+1616=1216 7.5x + 16 - 16 = -12 - 16

This simplifies to:
7.5x=28 7.5x = -28 .

Finally, solve for x x by dividing both sides by 7.5:

  • x=287.5 x = \frac{-28}{7.5}

Calculating the fraction gives approximately:
x3.73 x \approx -3.73 .

Therefore, the solution to the problem is x=3.73 x = -3.73 .

3

Final Answer

3.73 -3.73

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Convert mixed numbers to decimals first for easier calculation
  • Technique: Combine constants: -1/2 + 16½ = -0.5 + 16.5 = 16
  • Check: Substitute x = -3.73: 22(-3.73) + 16 = 14.5(-3.73) - 12 ✓

Common Mistakes

Avoid these frequent errors
  • Not properly combining fraction and mixed number constants
    Don't leave 12+1612 -\frac{1}{2} + 16\frac{1}{2} unsimplified = confusing calculations and wrong answers! Students often forget to convert or add these terms together. Always convert mixed numbers to decimals and combine all constants on each side first.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( 3x=18 \)

FAQ

Everything you need to know about this question

Should I convert the mixed number to an improper fraction or decimal?

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For this problem, decimals are easier! Convert 1612 16\frac{1}{2} to 16.5 and 12 -\frac{1}{2} to -0.5. This makes the arithmetic much simpler.

Why does 14.5x equal 14½x in the equation?

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They're the same! 14.5=1412 14.5 = 14\frac{1}{2} because 0.5 equals one-half. You can work with either form, but staying consistent with decimals helps avoid confusion.

How do I handle negative fractions in equations?

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Treat them like any negative number! 12 -\frac{1}{2} becomes -0.5. When combining with positive terms, subtract normally: 16.5 - 0.5 = 16.

What if I get a decimal answer instead of a fraction?

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That's perfectly normal! Many linear equations have decimal solutions. Just round appropriately (usually 2-3 decimal places) and always verify by substituting back.

Can I solve this by keeping everything as fractions?

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Yes, but it's much more work! You'd need to convert 14.5 to 292 \frac{29}{2} and work with common denominators. Decimals make this problem much simpler.

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