Solve Linear Equation: -33x+45-58 = 38x+144-15

Linear Equations with Multi-step Simplification

Find the value of the parameter X

33x+4558=38x+14415 -33x+45-58=38x+144-15

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:10 Let's find the value of X. Ready? Let's go!
00:14 First, we need to collect all the terms together. Make sure to gather similar ones.
00:27 Now, arrange the equation. Keep one side with the unknown X only.
00:48 Great! Next, isolate X so it stands alone.
00:59 And there you have it! This is how we solve for X.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Find the value of the parameter X

33x+4558=38x+14415 -33x+45-58=38x+144-15

2

Step-by-step solution

To solve the equation 33x+4558=38x+14415 -33x + 45 - 58 = 38x + 144 - 15 , we will simplify both sides:

  • First, combine like terms on the left side: 4558=13 45 - 58 = -13 .
  • This gives us: 33x13=38x+14415 -33x - 13 = 38x + 144 - 15 .
  • Now, simplify the right side: 14415=129 144 - 15 = 129 .
  • The equation now is: 33x13=38x+129 -33x - 13 = 38x + 129 .

Next, we'll move all x x -terms to one side:

  • Add 33x 33x to both sides: 33x+33x13=38x+33x+129 -33x + 33x - 13 = 38x + 33x + 129 .
  • This simplifies to: 13=71x+129 -13 = 71x + 129 .

Now, isolate the x x -term:

  • Subtract 129 from both sides: 13129=71x -13 - 129 = 71x .
  • This results in: 142=71x -142 = 71x .

Finally, solve for x x by dividing both sides by 71:

  • x=14271 x = -\frac{142}{71} .
  • Simplifying this fraction: x=2 x = -2 .

The correct value of x x is x=2 x = -2 . This corresponds to choice 3.

3

Final Answer

2 -2

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms on each side before isolating variables
  • Technique: Move all x-terms to one side: -33x - 38x = -71x
  • Check: Substitute x = -2: -33(-2) + 45 - 58 = 53 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to combine like terms first
    Don't jump straight to moving variables without simplifying = messy calculations and errors! This creates unnecessarily complex expressions with multiple constants to track. Always combine like terms on each side first, then isolate the variable.

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

Should I combine like terms first or move variables first?

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Always combine like terms first! In this problem, simplify 4558=13 45 - 58 = -13 and 14415=129 144 - 15 = 129 before moving any variables around.

How do I know which side to move the x-terms to?

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Move them to whichever side will give you a positive coefficient for x. Here, moving -33x to the right side gives us 71x 71x , which is easier than 71x -71x .

Why did we get -142 ÷ 71 = -2?

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When dividing 142 -142 by 71 71 , notice that 142=71×2 142 = 71 \times 2 . So 14271=2 \frac{-142}{71} = -2 exactly!

How can I check my answer quickly?

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Substitute x=2 x = -2 back into the original equation. Left side: 33(2)+4558=66+4558=53 -33(-2) + 45 - 58 = 66 + 45 - 58 = 53 . Right side: 38(2)+14415=76+14415=53 38(-2) + 144 - 15 = -76 + 144 - 15 = 53 . Both equal 53! ✓

What if I made an arithmetic mistake?

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Double-check each step! The most common errors are in combining like terms: 45 - 58 = -13 and 144 - 15 = 129. Use a calculator if needed for these basic operations.

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