Work out rearrange formula instantly with clear inputs, formula shown and shareable results.
Rearranging a formula applies inverse operations to both sides until the wanted variable stands alone. The same balance rules used to solve equations apply to symbols as well as numbers.
Rearrangements of ax + b = c
x = (c − b)/a, a = (c − b)/x, b = c − ax, c = ax + b
Subtract 9 to get 4x = 20, then divide by 4 to get x = 5.
You must never divide by a quantity that could be zero, which is why the calculator refuses a = 0 when solving for x.