Two Step Equation Calculator

Work out two step equation instantly with clear inputs, formula shown and shareable results.

About Two Step Equation Calculator

A two-step equation is undone in reverse order: first subtract the constant from both sides, then divide by the coefficient. So x = (c − b)/a.

Formula

Two-step solution

ax + b = c ⇒ x = (c − b) / a

Worked example

With the default values below, Two Step Equation Calculator returns x of 5.00000000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Coefficient a in ax + b = c: 3
Constant b: 7
Right-hand side c: 22

Results

x: 5.00000000
c − b (after step 1): 15.00000000
ax + b using the solution: 22.00000000
Equation solved: 3x + 7 = 22

Step by step

1Values used
2Two-step solution
3x= 5.00000000
4c − b (after step 1)= 15.00000000
5ax + b using the solution= 22.00000000
6Equation solved= 3x + 7 = 22

Assumptions and limits

The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Solve 3x + 7 = 22.

Subtract 7 to get 3x = 15, then divide by 3 to get x = 5.

Why subtract before dividing?

The addition was applied last when building the expression, so it must be undone first — inverse operations in reverse order.