42=8x+12x

Solution for 42=8x+12x equation:

Simplifying
42 = 8x + 12x

Combine like terms: 8x + 12x = 20x
42 = 20x

Solving
42 = 20x

Solving for variable 'x'.

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

Add '-20x' to each side of the equation.
42 + -20x = 20x + -20x

Combine like terms: 20x + -20x = 0
42 + -20x = 0

Add '-42' to each side of the equation.
42 + -42 + -20x = 0 + -42

Combine like terms: 42 + -42 = 0
0 + -20x = 0 + -42
-20x = 0 + -42

Combine like terms: 0 + -42 = -42
-20x = -42

Divide each side by '-20'.
x = 2.1

Simplifying
x = 2.1