Algebra Calculator
Solve ax + b = c for x, or a pair of simultaneous equations in two unknowns. Each step of the working is shown.
x
5
Check
3(5) + 7 = 22
How this was worked out
- Step 13x + 7 = 22
- Step 23x = 22 − 7 = 15
- Step 3x = 15 ÷ 3 = 5
Formula
ax + b = c → x = (c − b) ÷ a 2×2 system solved by Cramer’s rule
Example
Input
3x + 7 = 22
Result
x = 5
Frequently asked questions
Then the equation has no x term, so it is either always true or impossible — it is not a linear equation in x.
The two equations describe parallel or identical lines, so there is no single solution.
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