Solve Linear Equation: -31+48x+46 = 83x-85+15x

Linear Equations with Multiple Variable Terms

Find the value of the parameter X

31+48x+46=83x85+15x -31+48x+46=83x-85+15x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 Collect terms
00:18 Arrange the equation so that one side has only the unknown X
01:15 Isolate X
01:34 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

Find the value of the parameter X

31+48x+46=83x85+15x -31+48x+46=83x-85+15x

2

Step-by-step solution

To solve the given linear equation 31+48x+46=83x85+15x -31 + 48x + 46 = 83x - 85 + 15x , we'll follow these steps:

  • Step 1: Simplify both sides by combining like terms.
  • Step 2: Move all x x -terms to one side and constant terms to the other.
  • Step 3: Solve for x x .

Now, let's work through each step:

Step 1: Simplify both sides of the equation:
On the left side, combine like terms: 31+46=15 -31 + 46 = 15 . Thus, the left side becomes 15+48x 15 + 48x .
On the right side, combine the x x -terms: 83x+15x=98x 83x + 15x = 98x . The right side becomes 98x85 98x - 85 .

The equation now reads: 15+48x=98x85 15 + 48x = 98x - 85 .

Step 2: Move all x x -terms to one side and constant terms to the other:
Subtract 48x 48x from both sides: 15=98x48x85 15 = 98x - 48x - 85 .
Simplify the x x -terms: 98x48x=50x 98x - 48x = 50x . Thus, 15=50x85 15 = 50x - 85 .

Add 85 to both sides: 15+85=50x 15 + 85 = 50x , resulting in 100=50x 100 = 50x .

Step 3: Solve for x x by dividing both sides by 50:
x=10050=2 x = \frac{100}{50} = 2 .

Therefore, the solution to the problem is x=2 x = 2 .

3

Final Answer

2 2

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms on each side first before moving variables
  • Technique: Move all x-terms to one side: 98x - 48x = 50x
  • Check: Substitute x = 2: 15 + 48(2) = 111 and 98(2) - 85 = 111 ✓

Common Mistakes

Avoid these frequent errors
  • Moving variables before combining like terms
    Don't try to move 48x and 83x separately without first combining 83x + 15x = 98x! This creates messy fractions and calculation errors. Always combine like terms on each side first, then move all variables to one side.

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 combine like terms first?

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Combining like terms simplifies the equation and reduces errors! In this problem, 83x+15x=98x 83x + 15x = 98x on the right side makes the next steps much cleaner than working with three separate x-terms.

Which side should I move the x-terms to?

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Choose the side with the larger coefficient! Here, 98x is bigger than 48x, so keep variables on the right side. This way you avoid negative coefficients and make calculations easier.

What if I get a negative answer?

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Negative answers are completely valid! Always double-check by substituting back into the original equation. If both sides equal the same value, your negative answer is correct.

Can I move constants first instead of variables?

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Yes, but it's usually easier to move variables first because you'll end up with a simpler coefficient. Try both ways with practice problems to see which feels more natural!

How do I avoid arithmetic mistakes?

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Work step-by-step and write every calculation. For example: 31+46=15 -31 + 46 = 15 and 83+15=98 83 + 15 = 98 . Don't skip steps in your head!

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