0.80(x+90)+0.40x=108

Solution for 0.80(x+90)+0.40x=108 equation:

Simplifying
0.80(x + 90) + 0.40x = 108

Reorder the terms:
0.80(90 + x) + 0.40x = 108
(90 * 0.80 + x * 0.80) + 0.40x = 108
(72 + 0.80x) + 0.40x = 108

Combine like terms: 0.80x + 0.40x = 1.2x
72 + 1.2x = 108

Solving
72 + 1.2x = 108

Solving for variable 'x'.

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

Add '-72' to each side of the equation.
72 + -72 + 1.2x = 108 + -72

Combine like terms: 72 + -72 = 0
0 + 1.2x = 108 + -72
1.2x = 108 + -72

Combine like terms: 108 + -72 = 36
1.2x = 36

Divide each side by '1.2'.
x = 30

Simplifying
x = 30