Solve for X: 16x-30x+1.5=3.4+0.8+10x Linear Equation

Linear Equations with Decimal Coefficients

Solve for X:

16x30x+1.5=3.4+0.8+10x 16x-30x+1.5=3.4+0.8+10x

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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 X is isolated on one side
00:32 Collect like terms
00:35 Isolate X
00:47 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:

16x30x+1.5=3.4+0.8+10x 16x-30x+1.5=3.4+0.8+10x

2

Step-by-step solution

To solve the equation 16x30x+1.5=3.4+0.8+10x 16x - 30x + 1.5 = 3.4 + 0.8 + 10x , we follow these steps:

  • Simplify both sides by combining like terms.
    On the left side: 16x30x=14x 16x - 30x = -14x
    The left side becomes: 14x+1.5 -14x + 1.5
    On the right side: 3.4+0.8=4.2 3.4 + 0.8 = 4.2
    The right side becomes: 4.2+10x 4.2 + 10x
  • Re-arrange the equation to move all x x terms to one side and constant terms to the other:
    Start from 14x+1.5=4.2+10x -14x + 1.5 = 4.2 + 10x
  • Subtract 10x 10x from both sides to get all x x terms on one side:
    14x10x+1.5=4.2 -14x - 10x + 1.5 = 4.2
    Thus, we have 24x+1.5=4.2 -24x + 1.5 = 4.2 .
  • Subtract 1.5 1.5 from both sides to isolate terms with x x :
    24x=4.21.5 -24x = 4.2 - 1.5
    24x=2.7 -24x = 2.7
  • Finally, divide both sides by 24-24 to solve for x x :
    x=2.724=0.1125 x = \frac{2.7}{-24} = -0.1125
    Rounding to two decimal places, x0.11 x \approx -0.11 .

Therefore, the solution to the equation is x=0.11 x = -0.11 .

3

Final Answer

0.11 -0.11

Key Points to Remember

Essential concepts to master this topic
  • Simplification: Combine like terms first on both sides separately
  • Technique: Collect all x terms on one side: -14x - 10x = -24x
  • Check: Substitute x = -0.11 back: both sides equal 4.2 ✓

Common Mistakes

Avoid these frequent errors
  • Incorrectly combining x terms with different signs
    Don't add 16x - 30x as 46x instead of -14x = wrong coefficients! Students often forget that subtraction changes the sign. Always pay attention to positive and negative signs when combining like terms.

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 get a negative answer when the numbers seem positive?

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The coefficient of x becomes negative because 16x - 30x = -14x. When you have more negative x terms than positive ones, your final coefficient will be negative, leading to a negative solution.

Should I work with decimals or convert to fractions?

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Either way works! Decimals are often easier for this type of problem. Just be careful with your arithmetic and round appropriately at the end if needed.

How do I know which side to put the x terms on?

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It doesn't matter! Choose whichever side makes the coefficient of x positive to avoid working with negative numbers. In this problem, moving x terms to the right would give +24x instead of -24x.

What if I get a different decimal answer?

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Double-check your arithmetic! Common errors include: wrong signs when combining like terms, incorrect addition of constants like 3.4+0.8 3.4 + 0.8 , or division mistakes at the end.

Why does the explanation round to -0.11?

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The exact answer is 0.1125 -0.1125 , but when rounded to two decimal places it becomes -0.11. Always check if the problem asks for a specific number of decimal places.

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