Solve the Linear Equation: Find X in 27.19 - 13.25X + 19.28 = 13.21X - 19.2X + 11.8

Linear Equations with Decimal Coefficients

Solve for X:


27.1913.25x+19.28=13.21x19.2x+11.8 27.19-13.25x+19.28=13.21x-19.2x+11.8

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Find X
00:05 Collect like terms
00:27 Arrange the equation so that X is isolated on one side
00:56 Collect like terms
01:07 Isolate X
01:16 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:


27.1913.25x+19.28=13.21x19.2x+11.8 27.19-13.25x+19.28=13.21x-19.2x+11.8

2

Step-by-step solution

To solve the equation 27.1913.25x+19.28=13.21x19.2x+11.8 27.19 - 13.25x + 19.28 = 13.21x - 19.2x + 11.8 , we will follow these steps:

  • Simplify each side of the equation.
  • Combine like terms to consolidate x x terms and constant terms separately.
  • Isolate the variable x x on one side of the equation.

Let's start simplification:

1. Simplify the right side of the equation:
13.21x19.2x=(13.2119.2)x=5.99x 13.21x - 19.2x = (13.21 - 19.2)x = -5.99x ,
so the right side becomes 5.99x+11.8 -5.99x + 11.8 .

2. Simplify the left side of the equation:
Combine constants: 27.19+19.28=46.47 27.19 + 19.28 = 46.47 ,
so the left side becomes 46.4713.25x 46.47 - 13.25x .

Our equation now looks like:
46.4713.25x=5.99x+11.8 46.47 - 13.25x = -5.99x + 11.8 .

3. Combine like terms and solve for x x :
Add 5.99x 5.99x to both sides:
46.4713.25x+5.99x=11.8 46.47 - 13.25x + 5.99x = 11.8 ,
Simplifying gives us 46.477.26x=11.8 46.47 - 7.26x = 11.8 .

4. Isolate x x by subtracting 46.47 from both sides:
7.26x=11.846.47 -7.26x = 11.8 - 46.47 .
Simplifying gives 7.26x=34.67 -7.26x = -34.67 .

5. Solve for x x by dividing by 7.26-7.26:
x=34.677.264.77 x = \frac{-34.67}{-7.26} \approx 4.77 .

Therefore, the solution to the equation is x=4.77 x = 4.77 , which matches the correct choice provided.

3

Final Answer

4.77 4.77

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms on each side before solving
  • Technique: Move all x-terms to one side: -13.25x + 5.99x = -7.26x
  • Check: Substitute x = 4.77 back into original equation: both sides equal ✓

Common Mistakes

Avoid these frequent errors
  • Not combining like terms on the same side first
    Don't jump straight to moving terms across the equals sign without simplifying each side first = messy calculations and errors! This makes the problem unnecessarily complicated and leads to arithmetic mistakes. Always combine like terms on the same side before moving anything across the equals sign.

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 combine like terms on each side first?

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Combining like terms simplifies the equation before you start moving terms around. It's much easier to work with 5.99x -5.99x than 13.21x19.2x 13.21x - 19.2x !

What if I get confused with all the decimal numbers?

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Take it step by step! Write each calculation clearly: 13.2119.2=5.99 13.21 - 19.2 = -5.99 and 27.19+19.28=46.47 27.19 + 19.28 = 46.47 . Double-check your arithmetic.

How do I know which side to move the x-terms to?

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It doesn't matter! Choose the side that will give you a positive coefficient for x. In this problem, moving everything to the left gives 7.26x -7.26x , which works fine.

Should I round my decimal answer?

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Only if the problem asks you to! For x=4.77 x = 4.77 , this is already rounded to two decimal places. Always check if the problem specifies rounding instructions.

How can I check if x = 4.77 is really correct?

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Substitute back into the original equation: 27.1913.25(4.77)+19.28 27.19 - 13.25(4.77) + 19.28 should equal 13.21(4.77)19.2(4.77)+11.8 13.21(4.77) - 19.2(4.77) + 11.8 . Both sides should give the same result!

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