Solve the Fractional Equation: What Equals X in 70x + 4/3 + 6/9 = 68x - 15x?

Linear Equations with Fractional Constants

Solve for X:

70x+43+69=68x15x 70x+\frac{4}{3}+\frac{6}{9}=68x-15x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:06 Break down 6 into factors 2 and 3, 9 into factors 3 and 3
00:20 Arrange the equation so that one side has only the unknown X
00:26 Simplify what we can
00:34 Group like terms
00:44 Isolate X
00:51 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:

70x+43+69=68x15x 70x+\frac{4}{3}+\frac{6}{9}=68x-15x

2

Step-by-step solution

To solve the equation 70x+43+69=68x15x 70x + \frac{4}{3} + \frac{6}{9} = 68x - 15x , let's proceed with the following steps:

First, simplify the fractions on the left side. Notice that 69\frac{6}{9} simplifies to 23\frac{2}{3}.

So the equation becomes:

70x+43+23=68x15x 70x + \frac{4}{3} + \frac{2}{3} = 68x - 15x

Next, combine the fractions on the left side:

70x+(43+23)=68x15x 70x + \left(\frac{4}{3} + \frac{2}{3}\right) = 68x - 15x

This results in:

70x+63=68x15x 70x + \frac{6}{3} = 68x - 15x

The fraction 63\frac{6}{3} simplifies to 2, resulting in:

70x+2=68x15x 70x + 2 = 68x - 15x

Now, simplify the right side by combining like terms:

70x+2=53x 70x + 2 = 53x

Subtract 53x 53x from both sides to isolate terms involving x x on one side:

70x53x+2=0 70x - 53x + 2 = 0

This simplifies to:

17x+2=0 17x + 2 = 0

Subtract 2 from both sides to isolate the term with x x :

17x=2 17x = -2

Finally, divide both sides by 17 to solve for x x :

x=217 x = -\frac{2}{17}

Therefore, the solution to the problem is x=217 x = -\frac{2}{17} .

3

Final Answer

217 -\frac{2}{17}

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Reduce fractions first, then combine like terms systematically
  • Technique: Convert 69 \frac{6}{9} to 23 \frac{2}{3} , then add 43+23=2 \frac{4}{3} + \frac{2}{3} = 2
  • Check: Substitute x=217 x = -\frac{2}{17} : both sides equal 10617 -\frac{106}{17}

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify fractions before combining
    Don't leave 69 \frac{6}{9} unsimplified and try to add it to 43 \frac{4}{3} directly = messy calculations and wrong answers! This creates unnecessary complexity with different denominators. Always simplify fractions to lowest terms first, then combine like terms.

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 do I need to simplify 69 \frac{6}{9} first?

+

Simplifying 69=23 \frac{6}{9} = \frac{2}{3} makes adding fractions much easier! Now you can add 43+23=63=2 \frac{4}{3} + \frac{2}{3} = \frac{6}{3} = 2 directly instead of finding a common denominator.

How do I combine the x terms on the right side?

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Subtract the coefficients: 68x15x=(6815)x=53x 68x - 15x = (68-15)x = 53x . Remember, when subtracting variables with the same base, just subtract their coefficients!

What if I get a negative fraction as my answer?

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Negative fractions are completely normal solutions! Just make sure the fraction is in lowest terms. In this case, 217 -\frac{2}{17} cannot be simplified further.

Can I move all x terms to one side first?

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Yes! You could subtract 68x 68x from both sides first, then add 15x 15x . The order doesn't matter as long as you perform the same operation on both sides.

How do I check my answer with fractions?

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Substitute x=217 x = -\frac{2}{17} back into the original equation. Calculate each side separately and verify they're equal. Use a calculator if needed for complex fraction arithmetic!

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