5+18=42+x

Solution for 5+18=42+x equation:

Simplifying
5 + 18 = 42 + x

Combine like terms: 5 + 18 = 23
23 = 42 + x

Solving
23 = 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.
23 + -1x = 42 + x + -1x

Combine like terms: x + -1x = 0
23 + -1x = 42 + 0
23 + -1x = 42

Add '-23' to each side of the equation.
23 + -23 + -1x = 42 + -23

Combine like terms: 23 + -23 = 0
0 + -1x = 42 + -23
-1x = 42 + -23

Combine like terms: 42 + -23 = 19
-1x = 19

Divide each side by '-1'.
x = -19

Simplifying
x = -19