13=x-42

Solution for 13=x-42 equation:

Simplifying
13 = x + -42

Reorder the terms:
13 = -42 + x

Solving
13 = -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.
13 + -1x = -42 + x + -1x

Combine like terms: x + -1x = 0
13 + -1x = -42 + 0
13 + -1x = -42

Add '-13' to each side of the equation.
13 + -13 + -1x = -42 + -13

Combine like terms: 13 + -13 = 0
0 + -1x = -42 + -13
-1x = -42 + -13

Combine like terms: -42 + -13 = -55
-1x = -55

Divide each side by '-1'.
x = 55

Simplifying
x = 55