.8(x+90)+.8x=136

Solution for .8(x+90)+.8x=136 equation:

Simplifying
0.8(x + 90) + 0.8x = 136

Reorder the terms:
0.8(90 + x) + 0.8x = 136
(90 * 0.8 + x * 0.8) + 0.8x = 136
(72 + 0.8x) + 0.8x = 136

Combine like terms: 0.8x + 0.8x = 1.6x
72 + 1.6x = 136

Solving
72 + 1.6x = 136

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 + 1.6x = 136 + -72

Combine like terms: 72 + -72 = 0
0 + 1.6x = 136 + -72
1.6x = 136 + -72

Combine like terms: 136 + -72 = 64
1.6x = 64

Divide each side by '1.6'.
x = 40

Simplifying
x = 40