Solve for X: 17.3 - 7/9x + 2/18x = 3/9x - 5.8 Linear Equation

Linear Equations with Mixed Fractions

Solve for X:

17.379x+218x=39x5.8 17.3-\frac{7}{9}x+\frac{2}{18}x=\frac{3}{9}x-5.8

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:07 Calculate the quotient
00:25 Combine like terms
00:38 Arrange the equation so that X is isolated on one side
01:04 Combine like terms
01:15 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:

17.379x+218x=39x5.8 17.3-\frac{7}{9}x+\frac{2}{18}x=\frac{3}{9}x-5.8

2

Step-by-step solution

Let's solve the equation 17.379x+218x=39x5.8 17.3 - \frac{7}{9}x + \frac{2}{18}x = \frac{3}{9}x - 5.8 step-by-step.

First, simplify the equation by combining the x x -terms on both sides:

The term 218x\frac{2}{18}x can be simplified to 19x\frac{1}{9}x. Hence, the equation becomes:

17.379x+19x=39x5.8 17.3 - \frac{7}{9}x + \frac{1}{9}x = \frac{3}{9}x - 5.8 .

Combine the terms involving x x on the left side:

79x19x=69x=23x\frac{7}{9}x - \frac{1}{9}x = -\frac{6}{9}x = -\frac{2}{3}x. So, the equation transforms into:

17.323x=13x5.8 17.3 - \frac{2}{3}x = \frac{1}{3}x - 5.8 .

To isolate x x , first move all the terms involving x x to one side of the equation and the constant terms to the other side. Add 23x\frac{2}{3}x to both sides:

17.3=13x+23x5.8 17.3 = \frac{1}{3}x + \frac{2}{3}x - 5.8 .

Combine the x x -terms on the right:

17.3=x5.8 17.3 = x - 5.8 .

To solve for x x , add 5.8 5.8 to both sides:

17.3+5.8=x 17.3 + 5.8 = x .

Perform the addition:

23.1=x 23.1 = x .

Therefore, the solution to the equation is 23.1 \boxed{23.1} .

3

Final Answer

23.1 23.1

Key Points to Remember

Essential concepts to master this topic
  • Simplify fractions first: Convert 218x \frac{2}{18}x to 19x \frac{1}{9}x before combining
  • Combine like terms: 79x+19x=69x=23x -\frac{7}{9}x + \frac{1}{9}x = -\frac{6}{9}x = -\frac{2}{3}x
  • Check your solution: Substitute x = 23.1 back into original equation ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to simplify fractions before combining
    Don't leave 218x \frac{2}{18}x as is when combining with other ninth terms = wrong coefficients! This leads to incorrect calculations throughout. Always simplify fractions first: 218=19 \frac{2}{18} = \frac{1}{9} .

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 fractions before combining terms?

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Simplifying fractions makes it easier to combine like terms! For example, 218x \frac{2}{18}x and 79x \frac{7}{9}x look different, but when you simplify 218=19 \frac{2}{18} = \frac{1}{9} , you can easily combine them as ninths.

How do I combine fractions with the same denominator?

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When fractions have the same denominator, just add or subtract the numerators! For example: 79x+19x=7+19x=69x=23x -\frac{7}{9}x + \frac{1}{9}x = \frac{-7+1}{9}x = -\frac{6}{9}x = -\frac{2}{3}x

What's the fastest way to move terms to opposite sides?

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Use the opposite operation! If you have 23x -\frac{2}{3}x on the left, add 23x \frac{2}{3}x to both sides. This moves all x-terms to one side efficiently.

Can I convert everything to decimals instead of working with fractions?

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Yes, but be careful with rounding errors! Converting 79 \frac{7}{9} to 0.778... can lead to small mistakes. Working with exact fractions gives you the precise answer.

How do I check if x = 23.1 is correct?

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Substitute x = 23.1 into the original equation: 17.379(23.1)+218(23.1)=39(23.1)5.8 17.3 - \frac{7}{9}(23.1) + \frac{2}{18}(23.1) = \frac{3}{9}(23.1) - 5.8 . If both sides equal the same value, your answer is correct!

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