-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