Solve the Linear Equation: Break Down -2x + 4 + 10x - 8 = 3 - 4x + 17

Linear Equations with Variable Collection

Solve for X:

2x+4+10x8=34x+17 -2x+4+10x-8=3-4x+17

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Collect like terms
00:21 Arrange the equation so that X is isolated on one side
00:38 Collect like terms
00:42 Isolate X
00:50 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:

2x+4+10x8=34x+17 -2x+4+10x-8=3-4x+17

2

Step-by-step solution

To solve for x x in the given equation 2x+4+10x8=34x+17 -2x + 4 + 10x - 8 = 3 - 4x + 17 , follow these steps:

  • Step 1: Simplify both sides of the equation.
  • Start with the left-hand side of the equation:

    2x+4+10x8 -2x + 4 + 10x - 8 simplifies to:

    (2x+10x)+(48)=8x4 (-2x + 10x) + (4 - 8) = 8x - 4

    Now, simplify the right-hand side:

    34x+17 3 - 4x + 17 combines to:

    (3+17)4x=204x (3 + 17) - 4x = 20 - 4x

  • Step 2: Rearrange the equation to place all variable terms on one side and constant terms on the other.
  • We have:

    8x4=204x 8x - 4 = 20 - 4x

    Add 4x 4x to both sides to collect all x x -terms on the left:

    8x+4x4=20 8x + 4x - 4 = 20

    This simplifies to:

    12x4=20 12x - 4 = 20

  • Step 3: Solve for x x .
  • Add 4 to both sides to isolate the terms with x x :

    12x=24 12x = 24

    Finally, divide by 12 to solve for x x :

    x=2412=2 x = \frac{24}{12} = 2

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

3

Final Answer

2

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms on each side before moving variables
  • Technique: Add 4x to both sides: 8x - 4 = 20 - 4x becomes 12x - 4 = 20
  • Check: Substitute x = 2: 8(2) - 4 = 12 and 20 - 4(2) = 12 ✓

Common Mistakes

Avoid these frequent errors
  • Moving variables without combining like terms first
    Don't jump to moving variables before simplifying each side = messy equations with multiple x-terms scattered around! This creates confusion and calculation errors. Always combine like terms on each side first, then collect all variables on one side.

Practice Quiz

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\( x+x=8 \)

FAQ

Everything you need to know about this question

Why do I need to simplify both sides first?

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Simplifying first makes the equation much cleaner to work with! Instead of juggling 4 different x-terms, you'll have just 2 terms to move around.

Which side should I collect the variables on?

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Choose the side that will give you a positive coefficient for x. In this problem, moving variables to the left gives us 12x 12x , which is easier than 12x -12x .

What if I get the same variable term on both sides after simplifying?

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That's normal! Just add or subtract to move all variable terms to one side. Remember: whatever you do to one side, you must do to the other side.

How can I check my work without substituting?

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While substitution is the best check, you can also work backwards: start with your answer and see if you can recreate the original equation through reverse operations.

What does it mean when I get x = 0 as an answer?

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Zero is a perfectly valid solution! Always verify by substituting: if x=0 x = 0 makes both sides equal, then zero is your correct answer.

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