180-138=x

Solution for 180-138=x equation:

Simplifying
180 + -138 = x

Combine like terms: 180 + -138 = 42
42 = x

Solving
42 = 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.
42 + -1x = x + -1x

Combine like terms: x + -1x = 0
42 + -1x = 0

Add '-42' to each side of the equation.
42 + -42 + -1x = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -1x = 0 + -42
-1x = 0 + -42

Combine like terms: 0 + -42 = -42
-1x = -42

Divide each side by '-1'.
x = 42

Simplifying
x = 42