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 for X:

\( 6 - x = 10 - 2 \)

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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