Solve for X: 5(x-4)-6(7-x)=5x Linear Equation Solution

Linear Equations with Distribution and Simplification

Solve for X:

5(x4)6(7x)=5x 5(x-4)-6(7-x)=5x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:04 Make sure to open parentheses properly, multiply by each term
00:22 Solve each multiplication separately
00:33 Negative times negative always equals positive
00:42 Combine like terms
00:48 Arrange the equation so that X is isolated on one side
01:05 Combine like terms
01:12 Isolate X
01:26 Simplify as much as possible
01:30 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:

5(x4)6(7x)=5x 5(x-4)-6(7-x)=5x

2

Step-by-step solution

To solve the equation 5(x4)6(7x)=5x 5(x-4) - 6(7-x) = 5x , we will simplify both sides and solve for x x step-by-step:

Step 1: Distribute Constants inside Parentheses
Apply the distributive property to simplify each group:
- 5(x4) 5(x-4) becomes 5x20 5x - 20 .
- 6(7x)-6(7-x) becomes 42+6x-42 + 6x.

Resulting Equation:
5x2042+6x=5x 5x - 20 - 42 + 6x = 5x .

Step 2: Combine Like Terms
Combine 5x 5x and 6x 6x , and 20-20 and 42-42:
- 5x+6x=11x 5x + 6x = 11x .
- 2042=62-20 - 42 = -62.
The equation is now: 11x62=5x 11x - 62 = 5x .

Step 3: Isolate the Variable x x
Subtract 5x 5x from both sides to get the x x -terms on one side:
11x5x=62 11x - 5x = 62 .
This simplifies to 6x62=0 6x - 62 = 0 .

Step 4: Solve for x x
Add 62 to both sides to isolate the term with x x :
6x=62 6x = 62 .
Now, divide by 6 to solve for x x :
x=626=31310.33 x = \frac{62}{6} = \frac{31}{3} \approx 10.33 .

Therefore, x10.33 x \approx 10.33 .

3

Final Answer

10.33 10.33

Key Points to Remember

Essential concepts to master this topic
  • Distribution: Apply distributive property to both positive and negative terms
  • Technique: Combine like terms: 5x + 6x = 11x, -20 - 42 = -62
  • Check: Substitute x = 10.33: 5(6.33) - 6(-3.33) = 5(10.33) ✓

Common Mistakes

Avoid these frequent errors
  • Incorrect distribution with negative signs
    Don't distribute -6(7-x) as -42 - 6x = wrong signs! The negative outside changes both terms inside. Always distribute -6(7-x) as -42 + 6x, making the -x become +6x.

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 does -6(7-x) become -42 + 6x instead of -42 - 6x?

+

When you distribute a negative number, it changes the sign of every term inside! So -6 × 7 = -42 and -6 × (-x) = +6x. Remember: negative times negative equals positive.

How do I keep track of all the terms when combining?

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Organize by variable terms and constants separately. Write: 5x + 6x = 11x, then -20 - 42 = -62. This gives you 11x62=5x 11x - 62 = 5x .

Why do I get a decimal answer instead of a whole number?

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Not all equations have integer solutions! 626=31310.33 \frac{62}{6} = \frac{31}{3} \approx 10.33 is the exact answer. Decimals and fractions are perfectly valid solutions.

Can I move all x terms to the left side instead of the right?

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Absolutely! You could subtract 11x from both sides to get 62=6x -62 = -6x , then divide by -6. You'll get the same answer: x=626 x = \frac{62}{6} .

How can I check if 10.33 is really correct?

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Substitute back into the original equation: 5(10.334)6(710.33)=5(10.33) 5(10.33-4) - 6(7-10.33) = 5(10.33) . This gives 5(6.33)6(3.33)=51.65 5(6.33) - 6(-3.33) = 51.65 , and 31.65+19.98=51.6351.65 31.65 + 19.98 = 51.63 \approx 51.65

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