Solve for X: 3=(3x-1)×(1/3) Linear Equation Solution

Linear Equations with Fractional Multiplication

3=(3x1)×13 3=(3x-1)\times\frac{1}{3}

How much is Xworth?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Let's multiply by the denominator to eliminate the fraction, we'll multiply accordingly
00:14 Let's arrange the equation so that one side only has the unknown X
00:22 Let's isolate X
00:29 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

3=(3x1)×13 3=(3x-1)\times\frac{1}{3}

How much is Xworth?

2

Step-by-step solution

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

  • Step 1: Eliminate the fraction in the given equation by multiplying through by 3.
  • Step 2: Solve for x x by isolating it on one side of the equation.
  • Step 3: Compare the result to the provided answer choices and select the correct one.

Now, let's work through each step:

Step 1: Begin with the given equation:
3=(3x1)×13 3 = (3x - 1) \times \frac{1}{3}

To eliminate the fraction, multiply both sides by 3:
3×3=(3x1)×13×3 3 \times 3 = (3x - 1) \times \frac{1}{3} \times 3

This simplifies to:
9=3x1 9 = 3x - 1

Step 2: Solve for x x by isolating it:

Add 1 to both sides to remove the constant term on the right side:
9+1=3x1+1 9 + 1 = 3x - 1 + 1

Thus, we have:
10=3x 10 = 3x

Finally, divide both sides by 3 to isolate x x :
x=103 x = \frac{10}{3}

Step 3: Compare the result to the provided answer choices:

The value x=103 x = \frac{10}{3} is equivalent to the mixed number representation 313 3 \frac{1}{3} .

Therefore, the solution to the problem is 313 3\frac{1}{3} , which matches choice 3.

3

Final Answer

313 3\frac{1}{3}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Multiply both sides by same number to eliminate fractions
  • Technique: Multiply by 3: 3×3=3x1 3 \times 3 = 3x - 1 becomes 9
  • Check: Substitute x=313 x = 3\frac{1}{3} : (101)×13=3 (10-1) \times \frac{1}{3} = 3

Common Mistakes

Avoid these frequent errors
  • Forgetting to multiply the left side by 3
    Don't multiply only the right side by 3 = wrong equation! This creates 3=3x1 3 = 3x - 1 instead of 9=3x1 9 = 3x - 1 , giving x=43 x = \frac{4}{3} . Always multiply both sides by the same number to maintain equality.

Practice Quiz

Test your knowledge with interactive questions

\( 5x=1 \)

What is the value of x?

FAQ

Everything you need to know about this question

Why do I need to multiply both sides by 3?

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Multiplying by 3 eliminates the fraction 13 \frac{1}{3} on the right side, making the equation simpler to solve. Always multiply both sides to keep the equation balanced!

How do I convert 103 \frac{10}{3} to a mixed number?

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Divide 10 by 3: 10 ÷ 3 = 3 remainder 1. So 103=313 \frac{10}{3} = 3\frac{1}{3} . The quotient becomes the whole number, the remainder becomes the numerator.

What if I multiply by a different number instead of 3?

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You could multiply by any number, but choosing 3 makes the math easiest because it directly cancels the 13 \frac{1}{3} . Always choose the number that simplifies fractions most efficiently.

Can I solve this without eliminating the fraction first?

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Yes, but it's much harder! You could distribute 13 \frac{1}{3} to get 3=x13 3 = x - \frac{1}{3} , but working with fractions throughout increases mistakes. Eliminating fractions early is usually best.

How do I check my answer is correct?

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Substitute x=313=103 x = 3\frac{1}{3} = \frac{10}{3} back: (3×1031)×13=(101)×13=9×13=3 (3 \times \frac{10}{3} - 1) \times \frac{1}{3} = (10-1) \times \frac{1}{3} = 9 \times \frac{1}{3} = 3

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