Solve for X: Linear Equation with 3.6x and 7.4x + 6.4x Terms

Linear Equations with Multiple Variable Terms

Solve for X:

3.6x+4758=7.4x+6.4x+5 3.6x+47-58=7.4x+6.4x+5

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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
00:16 Arrange the equation so that one side has only the unknown X
00:32 Collect terms
00:39 Isolate X
00:54 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:

3.6x+4758=7.4x+6.4x+5 3.6x+47-58=7.4x+6.4x+5

2

Step-by-step solution

To solve the equation 3.6x+4758=7.4x+6.4x+5 3.6x + 47 - 58 = 7.4x + 6.4x + 5 , we will follow a step-by-step approach:

  • Step 1: Simplify each side of the equation.
    On the left-hand side, combine constants: 4758=11 47 - 58 = -11 . So, the left-hand side simplifies to 3.6x11 3.6x - 11 .
    On the right-hand side, combine like terms for x x : 7.4x+6.4x=13.8x 7.4x + 6.4x = 13.8x . So, the right-hand side simplifies to 13.8x+5 13.8x + 5 .
  • Step 2: Setup the equation with combined terms.
    The equation is now 3.6x11=13.8x+5 3.6x - 11 = 13.8x + 5 .
  • Step 3: Move terms to isolate x x .
    Subtract 3.6x 3.6x from both sides to get: 11=13.8x3.6x+5-11 = 13.8x - 3.6x + 5.
    This simplifies to: 11=10.2x+5-11 = 10.2x + 5.
  • Step 4: Isolate the variable term.
    Subtract 5 from both sides: 115=10.2x-11 - 5 = 10.2x.
    This gives 16=10.2x-16 = 10.2x.
  • Step 5: Solve for x x .
    Divide both sides by 10.2 to find x x . This results in x=1610.21.56 x = \frac{-16}{10.2} \approx -1.56 .

Therefore, the solution to the equation is x=1.56 x = -1.56 .

3

Final Answer

1.56 -1.56

Key Points to Remember

Essential concepts to master this topic
  • Combine Like Terms: Group x terms together and constants separately
  • Technique: Move all x terms to one side: 13.8x3.6x=10.2x 13.8x - 3.6x = 10.2x
  • Check: Substitute x=1.56 x = -1.56 back into original equation to verify both sides equal ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to combine like terms before moving variables
    Don't move variables one at a time without combining first = messy calculations and wrong answers! This creates confusion with multiple x terms on both sides. Always combine like terms on each side first, then move all variable terms to one side.

Practice Quiz

Test your knowledge with interactive questions

Solve the equation

\( 5x-15=30 \)

FAQ

Everything you need to know about this question

Why do I need to combine 7.4x + 6.4x first?

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You must combine like terms before moving variables! If you don't, you'll have multiple x terms scattered around, making it much harder to isolate x correctly.

Which side should I 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 to the right gives us 10.2x 10.2x which is positive and easier to work with.

How do I handle the decimal coefficients?

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Work with decimals directly - no need to convert to fractions! Just be careful with your arithmetic: 13.83.6=10.2 13.8 - 3.6 = 10.2 and 16÷10.2=1.56 -16 ÷ 10.2 = -1.56 .

What if I get a messy decimal answer?

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That's normal for equations with decimal coefficients! Round to a reasonable number of decimal places (usually 2-3) and always check your work by substituting back.

Can I multiply everything by 10 to avoid decimals?

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Absolutely! Multiplying the entire equation by 10 gives you: 36x110=138x+50 36x - 110 = 138x + 50 . This often makes calculations easier, but either method works fine.

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