Solve for X: 6.8 + 15x - 12.8 = 18x + 1.5 - 11x

Linear Equations with Decimal Coefficients

Sole for X:


6.8+15x12.8=18x+1.511x 6.8+15x-12.8=18x+1.5-11x

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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
00:15 Arrange the equation so that one side has only the unknown X
00:30 Collect like terms
00:35 Isolate X
00:44 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

Sole for X:


6.8+15x12.8=18x+1.511x 6.8+15x-12.8=18x+1.5-11x

2

Step-by-step solution

To solve the equation 6.8+15x12.8=18x+1.511x 6.8 + 15x - 12.8 = 18x + 1.5 - 11x , we follow these steps:

Step 1: Simplify both sides by combining like terms.

  • Left side: Combine 6.8 6.8 and 12.8 -12.8 :
  • 6.812.8=6 6.8 - 12.8 = -6
  • Thus, the left side becomes 15x6 15x - 6 .
  • Right side: Combine 18x 18x and 11x -11x :
  • 18x11x=7x 18x - 11x = 7x
  • Thus, the right side becomes 7x+1.5 7x + 1.5 .

Now the equation is 15x6=7x+1.5 15x - 6 = 7x + 1.5 .

Step 2: Isolate the variable x x on one side.

  • Subtract 7x 7x from both sides to get:
  • 15x7x6=7x7x+1.5 15x - 7x - 6 = 7x - 7x + 1.5
  • Which simplifies to 8x6=1.5 8x - 6 = 1.5 .

Step 3: Solve for x x :

  • Add 6 to both sides:
  • 8x=1.5+6 8x = 1.5 + 6
  • Simplify: 8x=7.5 8x = 7.5 .
  • Divide both sides by 8 to solve for x x :
  • x=7.58 x = \frac{7.5}{8}
  • Which simplifies to x=0.9375 x = 0.9375 .

Thus, the value of x x is approximately 0.93 \mathbf{0.93} , considering the formatting of the problem's answer choices.

Therefore, the solution to the problem is x=0.93 x = 0.93 .

3

Final Answer

0.93 0.93

Key Points to Remember

Essential concepts to master this topic
  • Simplify First: Combine like terms on both sides before isolating variables
  • Technique: Move all x-terms to one side: 15x - 7x = 8x
  • Check: Substitute x = 0.9375 back: both sides equal 5.0625 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to combine like terms first
    Don't jump straight to moving variables without simplifying = messy fractions and wrong answers! Students often get 6.8 + 15x - 12.8 = 18x + 1.5 - 11x and immediately start moving terms around. Always combine like terms first: left side becomes 15x - 6, right side becomes 7x + 1.5.

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( 6 - x = 10 - 2 \)

FAQ

Everything you need to know about this question

Why do I need to combine like terms first?

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Combining like terms simplifies the equation and prevents mistakes! Without it, you're juggling too many numbers at once. Always combine constants with constants and variables with variables first.

How do I know which terms are 'like terms'?

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Like terms have the same variable part. In this problem: 6.8 and -12.8 are both constants, while 18x and -11x both have x. Combine these separately!

Should I work with decimals or convert to fractions?

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Either way works! Decimals are often easier to calculate, but fractions give exact answers. Choose whichever method you're more comfortable with.

What if I get a different decimal answer?

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Check your arithmetic carefully! 7.58=0.9375 \frac{7.5}{8} = 0.9375 , which rounds to 0.93. Make sure you simplified both sides correctly before solving.

How do I check my answer?

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Substitute x=0.9375 x = 0.9375 back into the original equation. Calculate both sides separately - they should equal approximately 5.06.

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