72=-9r

Solution for 72=-9r equation:

Simplifying
72 = -9r

Solving
72 = -9r

Solving for variable 'r'.

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

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

Combine like terms: -9r + 9r = 0
72 + 9r = 0

Add '-72' to each side of the equation.
72 + -72 + 9r = 0 + -72

Combine like terms: 72 + -72 = 0
0 + 9r = 0 + -72
9r = 0 + -72

Combine like terms: 0 + -72 = -72
9r = -72

Divide each side by '9'.
r = -8

Simplifying
r = -8