Solve the Fraction Equation: Find X in 9/11 - 8/15x = 8/22

Linear Equations with Multiple Fractions

Solve for X:

911815x=822 \frac{9}{11}-\frac{8}{15}x=\frac{8}{22}

❤️ Continue Your Math Journey!

We have hundreds of course questions with personalized recommendations + Account 100% premium

Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to isolate the unknown X
00:08 We'll arrange the equation so that X is alone on one side
00:22 We'll reduce what we can
00:38 We'll break down 8 into factors 4 and 2, and 22 into factors 11 and 2
00:52 We'll reduce what we can
00:56 We'll write everything under one fraction
01:04 We'll isolate X and calculate
01:09 We'll multiply by the reciprocal fraction to eliminate the fraction
01:30 We'll reduce what we can
01:34 Negative times negative always equals positive
01:37 Make sure to multiply numerator by numerator and denominator by denominator
01:40 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:

911815x=822 \frac{9}{11}-\frac{8}{15}x=\frac{8}{22}

2

Step-by-step solution

To solve the equation 911815x=822 \frac{9}{11} - \frac{8}{15}x = \frac{8}{22} , follow these steps:

  • Step 1: Find the least common denominator (LCD) of 11, 15, and 22, which is 330.
  • Step 2: Multiply every term in the equation by 330 to eliminate the fractions:
    330×911330×815x=330×822 330 \times \frac{9}{11} - 330 \times \frac{8}{15}x = 330 \times \frac{8}{22} .
  • Step 3: Simplify each term:
    - For 911 \frac{9}{11} : 330×911=270 330 \times \frac{9}{11} = 270 ,
    - For 815x \frac{8}{15}x : 330×815x=176x 330 \times \frac{8}{15}x = 176x ,
    - For 822 \frac{8}{22} : 330×822=120 330 \times \frac{8}{22} = 120 .
  • Step 4: Substitute back into the equation:
    270176x=120 270 - 176x = 120 .
  • Step 5: Isolate x x :
    - Subtract 270 from both sides: 176x=120270-176x = 120 - 270,
    - Simplify: 176x=150-176x = -150,
    - Divide both sides by 176-176: x=150176=7588x = \frac{-150}{-176} = \frac{75}{88}.

Thus, the value of x x is 7588 \frac{75}{88} .

3

Final Answer

7588 \frac{75}{88}

Key Points to Remember

Essential concepts to master this topic
  • LCD Method: Multiply every term by 330 to eliminate all fractions
  • Technique: Convert 911 \frac{9}{11} to 270 using 330 × 9 ÷ 11
  • Check: Substitute x = 7588 \frac{75}{88} back into original equation ✓

Common Mistakes

Avoid these frequent errors
  • Not multiplying every single term by the LCD
    Don't multiply just 815x \frac{8}{15}x by 330 and skip the other fractions = wrong equation! This creates an unbalanced equation with mixed fractions and whole numbers. Always multiply every term on both sides by the LCD.

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 is the LCD 330 and not something smaller?

+

The LCD is the smallest number divisible by 11, 15, and 22. Since 11 × 15 × 2 = 330, and this is the smallest such number, using 330 eliminates all fractions efficiently.

Can I solve this without finding the LCD?

+

You could move terms around first, but the LCD method is faster and less error-prone. It clears all fractions at once, turning the problem into simple integer arithmetic.

How do I simplify 150/176 to 75/88?

+

Find the greatest common factor (GCF) of 150 and 176, which is 2. Then divide both numerator and denominator: 150÷2176÷2=7588 \frac{150 ÷ 2}{176 ÷ 2} = \frac{75}{88} .

What if I get negative numbers during solving?

+

That's normal! In step 5, we got -176x = -150. When you divide negative by negative, you get positive: 150176=7588 \frac{-150}{-176} = \frac{75}{88} .

How can I check my answer is correct?

+

Substitute x=7588 x = \frac{75}{88} back into 911815x=822 \frac{9}{11} - \frac{8}{15}x = \frac{8}{22} . Calculate the left side and verify it equals 411 \frac{4}{11} !

🌟 Unlock Your Math Potential

Get unlimited access to all 18 Linear Equations (One Variable) questions, detailed video solutions, and personalized progress tracking.

📹

Unlimited Video Solutions

Step-by-step explanations for every problem

📊

Progress Analytics

Track your mastery across all topics

🚫

Ad-Free Learning

Focus on math without distractions

No credit card required • Cancel anytime

More Questions

Click on any question to see the complete solution with step-by-step explanations