Solve for X in (3-2x)⋅5 = 4+12x: Linear Equation Practice

Linear Equations with Distribution and Collection

Solve for X:

(32x)5=4+12x (3-2x)\cdot5=4+12x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:04 We want to isolate the unknown X
00:08 Open parentheses properly, multiply by each factor
00:20 Solve each multiplication separately
00:37 Positive times negative always equals negative
00:46 Isolate the unknown X
01:10 Collect terms
01:15 Simplify what's possible
01:34 Isolate the unknown X
01:44 Factor 22 into 11 and 2
01:47 Simplify what's possible
01:53 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:

(32x)5=4+12x (3-2x)\cdot5=4+12x

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Distribute and simplify the equation.
  • Step 2: Combine like terms to isolate x x on one side of the equation.
  • Step 3: Solve for x x .

Let's begin solving the equation:

Step 1: Distribute and simplify.
The given equation is (32x)5=4+12x (3 - 2x) \cdot 5 = 4 + 12x .
First, we distribute 5 to both terms inside the parenthesis:

5352x=4+12x 5 \cdot 3 - 5 \cdot 2x = 4 + 12x .

This simplifies to:

1510x=4+12x 15 - 10x = 4 + 12x .

Step 2: Combine like terms to isolate x x on one side of the equation.
Add 10x 10x to both sides to get all terms involving x x on the right-hand side:

15=4+12x+10x 15 = 4 + 12x + 10x .

This simplifies to:

15=4+22x 15 = 4 + 22x .

Subtract 4 from both sides to isolate the term involving x x :

154=22x 15 - 4 = 22x .

This simplifies to:

11=22x 11 = 22x .

Step 3: Solve for x x .
To find x x , divide both sides of the equation by 22:

x=1122 x = \frac{11}{22} .

Upon simplification, 1122 \frac{11}{22} reduces to 12 \frac{1}{2} .

Therefore, the solution to the equation is x=12 x = \frac{1}{2} .

3

Final Answer

12 \frac{1}{2}

Key Points to Remember

Essential concepts to master this topic
  • Distribution: Multiply each term inside parentheses by the outside factor
  • Collection: Move all x terms to one side: 15 - 10x = 4 + 12x becomes 15 = 4 + 22x
  • Verification: Substitute x=12 x = \frac{1}{2} back: both sides equal 10 10

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute to all terms inside parentheses
    Don't just multiply 5 × 3 and forget about the -2x = wrong equation! This creates an imbalanced equation because you're only applying the distributive property partially. Always multiply the outside factor by every single term inside the parentheses.

Practice Quiz

Test your knowledge with interactive questions

\( x+7=14 \)

\( x=\text{?} \)

FAQ

Everything you need to know about this question

Why do I need to distribute first instead of dividing both sides by 5?

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You can't divide by 5 when it's only multiplying part of one side! The 5 multiplies the entire expression (32x) (3-2x) , so you must distribute it to both terms inside the parentheses first.

How do I keep track of positive and negative signs when distributing?

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Be extra careful with the second term! When you distribute 5 to -2x, you get 5×(2x)=10x 5 \times (-2x) = -10x . The negative sign stays with the 2x.

Why did we move all x terms to the right side instead of the left?

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It doesn't matter which side you choose! Moving x terms to the right (where we have +12x) just keeps the coefficient positive, making the arithmetic easier. You could move them left instead.

Is there a way to check my answer without substituting back?

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Substitution is the best way to verify! But you can also check if your final equation step makes sense: 11=22x 11 = 22x means x should be about 12 \frac{1}{2} since 22 × 0.5 = 11.

What if I get a different denominator when simplifying my fraction?

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Double-check your arithmetic! 1122 \frac{11}{22} should always simplify to 12 \frac{1}{2} because both 11 and 22 are divisible by 11. If you get something else, retrace your steps.

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