Solve for X in the Linear Equation: 3x-5=10

Linear Equations with Two-Step Solutions

Solve for X:

3x5=10 3x-5=10

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 We want to isolate the unknown X
00:09 Let's arrange the equation so that one side has only the unknown X
00:28 Let's simplify what we can
00:37 Let's isolate the unknown X and calculate
00:57 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:

3x5=10 3x-5=10

2

Step-by-step solution

To solve the equation 3x5=103x - 5 = 10, we follow these steps:

  • Add 55 to both sides of the equation to eliminate the 5-5:
    3x5+5=10+53x - 5 + 5 = 10 + 5
    Simplifies to:
    3x=153x = 15
  • Next, divide both sides of the equation by 33 to solve for xx:
    3x3=153\frac{3x}{3} = \frac{15}{3}
    This results in:
    x=5x = 5

Therefore, the solution to the equation is x=5x = 5.

3

Final Answer

5

Key Points to Remember

Essential concepts to master this topic
  • Inverse Operations: Add 5 first, then divide by 3 to isolate x
  • Technique: 3x - 5 + 5 = 10 + 5 gives 3x = 15
  • Check: Substitute back: 3(5) - 5 = 15 - 5 = 10 ✓

Common Mistakes

Avoid these frequent errors
  • Dividing by 3 before adding 5
    Don't divide first: (3x - 5) ÷ 3 = 10 ÷ 3 gives x - 5/3 = 10/3, making it much harder! This creates unnecessary fractions and complicates the solution. Always eliminate addition/subtraction terms first, then handle multiplication/division.

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 add 5 to both sides first?

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You want to isolate the term with x by getting rid of the -5 first. Adding 5 cancels out the -5, leaving you with just 3x=15 3x = 15 , which is much easier to solve!

What if I divided by 3 first instead?

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You'd get x53=103 x - \frac{5}{3} = \frac{10}{3} , which involves fractions and makes the problem unnecessarily complicated. Always eliminate constants first to keep things simple!

How do I know which operation to do first?

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Follow the reverse order of operations! Since the equation has 3x5 3x - 5 , you undo the subtraction first (add 5), then undo the multiplication (divide by 3).

Can I check my answer a different way?

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Yes! Besides substituting back, you can also work backwards: if x=5 x = 5 , then 3×5=15 3 \times 5 = 15 , and 155=10 15 - 5 = 10

What if my answer doesn't check out?

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Don't panic! Go back and check each step carefully. Common errors include sign mistakes or forgetting to do the same operation to both sides of the equation.

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