0.7(x+80)+0.1x=72

Solution for 0.7(x+80)+0.1x=72 equation:

Simplifying
0.7(x + 80) + 0.1x = 72

Reorder the terms:
0.7(80 + x) + 0.1x = 72
(80 * 0.7 + x * 0.7) + 0.1x = 72
(56 + 0.7x) + 0.1x = 72

Combine like terms: 0.7x + 0.1x = 0.8x
56 + 0.8x = 72

Solving
56 + 0.8x = 72

Solving for variable 'x'.

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

Add '-56' to each side of the equation.
56 + -56 + 0.8x = 72 + -56

Combine like terms: 56 + -56 = 0
0 + 0.8x = 72 + -56
0.8x = 72 + -56

Combine like terms: 72 + -56 = 16
0.8x = 16

Divide each side by '0.8'.
x = 20

Simplifying
x = 20