Solve the Equation for X: 7.1 + 3.18x - 1.14 = 9.14x + 3.5x + 1.9

Linear Equations with Decimal Coefficients

Solve for X:

7.1+3.18x1.14=9.14x+3.5x+1.9 7.1+3.18x-1.14=9.14x+3.5x+1.9

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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 terms
00:19 Arrange the equation so that one side has only the unknown X
00:44 Collect terms
00:54 Isolate X
01:05 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:

7.1+3.18x1.14=9.14x+3.5x+1.9 7.1+3.18x-1.14=9.14x+3.5x+1.9

2

Step-by-step solution

To solve this linear equation, we'll follow these steps:

  • Step 1: Combine like terms on each side of the equation.
  • Step 2: Move all terms involving x x to one side of the equation.
  • Step 3: Isolate the variable x x to solve for it.

Let's work through each step:

Step 1: Simplify both sides of the equation.
On the left side, combine like terms: 7.11.14+3.18x=5.96+3.18x 7.1 - 1.14 + 3.18x = 5.96 + 3.18x .
On the right side, combine like terms involving x x and constant terms: 9.14x+3.5x+1.9=12.64x+1.9 9.14x + 3.5x + 1.9 = 12.64x + 1.9 .

Step 2: Rearrange to move all x x terms to one side.
We start with the simplified equation: 5.96+3.18x=12.64x+1.9 5.96 + 3.18x = 12.64x + 1.9 .
Subtract 3.18x 3.18x from both sides to get: 5.96=12.64x3.18x+1.9 5.96 = 12.64x - 3.18x + 1.9 .

This simplifies to 5.96=9.46x+1.9 5.96 = 9.46x + 1.9 .

Step 3: Isolate x x by performing arithmetic operations.
Subtract 1.9 from both sides: 5.961.9=9.46x 5.96 - 1.9 = 9.46x .
This gives us 4.06=9.46x 4.06 = 9.46x .

Finally, divide both sides by 9.46 to solve for x x :
x=4.069.460.42 x = \frac{4.06}{9.46} \approx 0.42 .

Therefore, the solution to the problem is x=0.42 x = 0.42 .

3

Final Answer

0.42 0.42

Key Points to Remember

Essential concepts to master this topic
  • Combining: Group like terms on each side before moving variables
  • Technique: Subtract 3.18x 3.18x from 12.64x 12.64x to get 9.46x 9.46x
  • Check: Substitute x=0.42 x = 0.42 : both sides equal approximately 7.32 ✓

Common Mistakes

Avoid these frequent errors
  • Moving variables without combining like terms first
    Don't move 3.18x 3.18x to the right side while 9.14x+3.5x 9.14x + 3.5x are still separate = messy equation with more terms! This creates confusion and calculation errors. Always combine like terms on each side first, then move variables.

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 before moving variables?

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Combining like terms first simplifies your equation! Instead of dealing with 9.14x+3.5x 9.14x + 3.5x separately, you get one clean term: 12.64x 12.64x . This reduces calculation errors.

How do I handle all these decimal calculations?

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Take your time with each step and double-check your arithmetic. Consider using a calculator for decimal operations, but make sure you understand each step conceptually.

What if I get a different decimal answer?

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Decimal equations can be tricky! Make sure you're combining like terms correctly and not making rounding errors. The exact answer is 4.069.46 \frac{4.06}{9.46} which equals approximately 0.42.

Should I convert decimals to fractions first?

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Not necessary! You can work directly with decimals. Just be extra careful with your arithmetic and consider keeping more decimal places during calculations to avoid rounding errors.

How do I check my answer with all these decimals?

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Substitute x=0.42 x = 0.42 back into the original equation. Calculate both sides separately: left side = 7.1+3.18(0.42)1.14 7.1 + 3.18(0.42) - 1.14 and right side = 9.14(0.42)+3.5(0.42)+1.9 9.14(0.42) + 3.5(0.42) + 1.9 . Both should be approximately equal.

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