15-7(-8)+20=x

Solution for 15-7(-8)+20=x equation:

Simplifying
15 + -7(-8) + 20 = x

Multiply -7 * -8
15 + 56 + 20 = x

Combine like terms: 15 + 56 = 71
71 + 20 = x

Combine like terms: 71 + 20 = 91
91 = x

Solving
91 = 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.
91 + -1x = x + -1x

Combine like terms: x + -1x = 0
91 + -1x = 0

Add '-91' to each side of the equation.
91 + -91 + -1x = 0 + -91

Combine like terms: 91 + -91 = 0
0 + -1x = 0 + -91
-1x = 0 + -91

Combine like terms: 0 + -91 = -91
-1x = -91

Divide each side by '-1'.
x = 91

Simplifying
x = 91