Power Calculators

x Two-Step Equation Solver

Solve equations of the form a(x + b) = c for x.

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Also available in our Android app, with charts and full breakdown tables.

📘 About the Two-Step Equation

A two-step equation can be solved by reversing multiplication and addition operations.

🧮 Formula

Where

  • a = outside coefficient
  • b = inside constant
  • c = right side
x = c/a - b.

✏️ Worked example

3(x + 2) = 15

You enter
Coefficient a3
Inside constant b2
Right side c15
You get
x3

The solution is 3.

Try this example →

🧭 How to use this calculator

What you enter

  • Coefficient a
  • Inside constant b
  • Right side c

What you get

  • x

💡 Method

  • Divide both sides by a.
  • Subtract b from the result.
  • a must not be zero.

❓ Frequently asked questions

What if a is zero?

Division by zero is undefined, so use a non-zero coefficient.