Solve for X: 17.5 - 18x - 5.5x = 19.2 + 14½ - 5x Linear Equation

Linear Equations with Mixed Decimals

Solve for X:

17.5−18x−5.5x=19.2+1412−5x 17.5-18x-5.5x=19.2+14\frac{1}{2}-5x

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:11 Let's solve this equation together.
00:14 First, we want to find the unknown, which is X.
00:19 Next, collect all the like terms.
00:31 Rearrange the equation so that X is on one side.
00:59 Now, let's simplify wherever possible.
01:16 Keep X isolated, and calculate its value.
01:33 Again, gather like terms to simplify further.
01:50 Continue isolating X until we're done.
02:04 And finally, we have solved the problem!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve for X:

17.5−18x−5.5x=19.2+1412−5x 17.5-18x-5.5x=19.2+14\frac{1}{2}-5x

2

Step-by-step solution

To solve the equation 17.5−18x−5.5x=19.2+1412−5x 17.5 - 18x - 5.5x = 19.2 + 14\frac{1}{2} - 5x , follow these steps:

Step 1: Combine like terms on both sides of the equation.

  • On the left side, combine −18x−5.5x -18x - 5.5x , which simplifies to −23.5x -23.5x .
  • On the right side, simplify 19.2+14.5−5x 19.2 + 14.5 - 5x . The fraction 1412 14\frac{1}{2} is converted to decimal form as 14.5 14.5 , giving 19.2+14.5=33.7 19.2 + 14.5 = 33.7 .

Step 2: Rewrite the equation with the simplified terms:

17.5−23.5x=33.7−5x 17.5 - 23.5x = 33.7 - 5x .

Step 3: Get all terms involving x x on one side of the equation and constant terms on the other.

  • Add 5x 5x to both sides to move all x x related terms to the left:
  • 17.5−23.5x+5x=33.7 17.5 - 23.5x + 5x = 33.7
  • This further simplifies to 17.5−18.5x=33.7 17.5 - 18.5x = 33.7 .

    Step 4: Isolate the term with x x by subtracting 17.5 17.5 from both sides:

    −18.5x=33.7−17.5 -18.5x = 33.7 - 17.5 .

    The right side evaluates to 16.2 16.2 .

    Thus, we have −18.5x=16.2 -18.5x = 16.2 .

    Step 5: Solve for x x by dividing both sides by −18.5-18.5:

    x=16.2−18.5≈−0.8757 x = \frac{16.2}{-18.5} \approx -0.8757 .

    Rounding −0.8757 -0.8757 to two decimal places gives x=−0.87 x = -0.87 .

    Therefore, the solution to the equation is x=−0.87 x = -0.87 .

    This corresponds to option 2 in the given choices.

3

Final Answer

−0.87 -0.87

Key Points to Remember

Essential concepts to master this topic
  • Combine Like Terms: Group all x-terms and all constants separately
  • Technique: Convert 1412 14\frac{1}{2} to 14.5 before adding to 19.2
  • Check: Substitute x = -0.87 back: both sides equal approximately 33.7 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to convert mixed numbers to decimals
    Don't leave 1412 14\frac{1}{2} as a fraction while working with decimals = calculation errors! This makes combining terms much harder and leads to wrong answers. Always convert mixed numbers to decimals first: 1412=14.5 14\frac{1}{2} = 14.5 .

Practice Quiz

Test your knowledge with interactive questions

Solve for X:

\( 2 + x - 5 = 4 - 3 \)

FAQ

Everything you need to know about this question

Why do I need to convert the mixed number to a decimal?

+

Converting 1412 14\frac{1}{2} to 14.5 keeps all numbers in the same format! This makes adding 19.2 + 14.5 = 33.7 much easier than mixing fractions and decimals.

How do I combine -18x and -5.5x correctly?

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Just add the coefficients: -18 + (-5.5) = -23.5. So −18x−5.5x=−23.5x -18x - 5.5x = -23.5x . Think of it like combining -18 apples and -5.5 apples.

What's the best way to move x-terms to one side?

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Add the opposite of what you want to move! To move −5x -5x from the right side, add +5x +5x to both sides. This keeps the equation balanced.

Why is my answer negative?

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Negative solutions are completely normal! When you divide positive 16.2 by negative -18.5, you get a negative result. Always trust your algebra!

How precise should my final answer be?

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The problem gives answer choices to 2 decimal places, so round your exact answer −0.8757... -0.8757... to -0.87. Match the precision of the given options.

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