9(8+x)=-x

Solution for 9(8+x)=-x equation:

Simplifying
9(8 + x) = -1x
(8 * 9 + x * 9) = -1x
(72 + 9x) = -1x

Solving
72 + 9x = -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
72 + 9x + x = -1x + x

Combine like terms: 9x + x = 10x
72 + 10x = -1x + x

Combine like terms: -1x + x = 0
72 + 10x = 0

Add '-72' to each side of the equation.
72 + -72 + 10x = 0 + -72

Combine like terms: 72 + -72 = 0
0 + 10x = 0 + -72
10x = 0 + -72

Combine like terms: 0 + -72 = -72
10x = -72

Divide each side by '10'.
x = -7.2

Simplifying
x = -7.2