90-42=x

Solution for 90-42=x equation:

Simplifying
90 + -42 = x

Combine like terms: 90 + -42 = 48
48 = x

Solving
48 = 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.
48 + -1x = x + -1x

Combine like terms: x + -1x = 0
48 + -1x = 0

Add '-48' to each side of the equation.
48 + -48 + -1x = 0 + -48

Combine like terms: 48 + -48 = 0
0 + -1x = 0 + -48
-1x = 0 + -48

Combine like terms: 0 + -48 = -48
-1x = -48

Divide each side by '-1'.
x = 48

Simplifying
x = 48