Fractional Equation Challenge: Solve for X in 1/3(1/3x + 1/6) = 1/18

Linear Equations with Nested Fractions

Solve for X:

13(13x+16)=118 \frac{1}{3}(\frac{1}{3}x+\frac{1}{6})=\frac{1}{18}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:03 Open parentheses properly, multiply by each factor
00:16 Arrange the equation so that X is isolated on one side
00:27 Combine like terms
00:31 Isolate X
00:37 And 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:

13(13x+16)=118 \frac{1}{3}(\frac{1}{3}x+\frac{1}{6})=\frac{1}{18}

2

Step-by-step solution

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

  • Step 1: Distribute and expand the equation.
  • Step 2: Eliminate the fractions by multiplying through by the least common denominator.
  • Step 3: Solve for x x .

Now, let's work through each step:

Step 1: Distribute 13\frac{1}{3} across the terms in the parentheses:
13(13x+16)\frac{1}{3} \left(\frac{1}{3}x + \frac{1}{6}\right) becomes 1313x+1316\frac{1}{3} \cdot \frac{1}{3}x + \frac{1}{3} \cdot \frac{1}{6}, resulting in 19x+118\frac{1}{9}x + \frac{1}{18}.

Step 2: The equation is now 19x+118=118\frac{1}{9}x + \frac{1}{18} = \frac{1}{18}.
To eliminate the fractions, we identify the least common denominator, which is 18.

Multiply everything by 18 to clear the fractions:

1819x+18118=1811818 \cdot \frac{1}{9}x + 18 \cdot \frac{1}{18} = 18 \cdot \frac{1}{18}

Which simplifies to:

2x+1=12x + 1 = 1

Step 3: Solve the resulting linear equation:

Subtract 1 from both sides to isolate the term with x x :
2x=02x = 0

Divide both sides by 2 to solve for x x :
x=0x = 0

Therefore, the solution to the problem is x=0 x = 0 .

3

Final Answer

0

Key Points to Remember

Essential concepts to master this topic
  • Distribution: Multiply 13 \frac{1}{3} through parentheses to get 19x+118 \frac{1}{9}x + \frac{1}{18}
  • LCD Method: Multiply entire equation by 18 to clear fractions completely
  • Verification: Substitute x = 0: 13(0+16)=118 \frac{1}{3}(0 + \frac{1}{6}) = \frac{1}{18}

Common Mistakes

Avoid these frequent errors
  • Forgetting to distribute the outside fraction
    Don't solve 13x+16=118 \frac{1}{3}x + \frac{1}{6} = \frac{1}{18} directly = wrong equation! This skips the crucial distribution step. Always distribute the 13 \frac{1}{3} to both terms inside parentheses first.

Practice Quiz

Test your knowledge with interactive questions

Solve for x:

\( 2(4-x)=8 \)

FAQ

Everything you need to know about this question

Why do I need to distribute first before solving?

+

The parentheses mean you must multiply 13 \frac{1}{3} by everything inside them. Skipping this step changes the entire equation and leads to wrong answers!

What's the LCD when I have denominators 9 and 18?

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Since 18 = 2 × 9, the LCD is 18. This means 18 is the smallest number that both 9 and 18 divide into evenly.

How do I multiply fractions like 1/3 × 1/3?

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Multiply numerators together and denominators together: 13×13=1×13×3=19 \frac{1}{3} \times \frac{1}{3} = \frac{1 \times 1}{3 \times 3} = \frac{1}{9}

Why does x = 0 make sense as an answer?

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Zero is a perfectly valid solution! When you substitute x = 0, both sides of the original equation equal 118 \frac{1}{18} , so the equation balances correctly.

What if I get confused with all the fractions?

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Take it one step at a time! First distribute, then find a common denominator, then multiply through to clear fractions. Breaking it into small steps prevents errors.

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