31-15=x

Solution for 31-15=x equation:

Simplifying
31 + -15 = x

Combine like terms: 31 + -15 = 16
16 = x

Solving
16 = x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
16 + -1x = x + -1x

Combine like terms: x + -1x = 0
16 + -1x = 0

Add '-16' to each side of the equation.
16 + -16 + -1x = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -1x = 0 + -16
-1x = 0 + -16

Combine like terms: 0 + -16 = -16
-1x = -16

Divide each side by '-1'.
x = 16

Simplifying
x = 16