X-42+x=90

Solution for X-42+x=90 equation:

Simplifying
X + -42 + x = 90

Reorder the terms:
-42 + X + x = 90

Solving
-42 + X + x = 90

Solving for variable 'X'.

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

Add '42' to each side of the equation.
-42 + X + 42 + x = 90 + 42

Reorder the terms:
-42 + 42 + X + x = 90 + 42

Combine like terms: -42 + 42 = 0
0 + X + x = 90 + 42
X + x = 90 + 42

Combine like terms: 90 + 42 = 132
X + x = 132

Add '-1x' to each side of the equation.
X + x + -1x = 132 + -1x

Combine like terms: x + -1x = 0
X + 0 = 132 + -1x
X = 132 + -1x

Simplifying
X = 132 + -1x