108=15r-6r

Solution for 108=15r-6r equation:

Simplifying
108 = 15r + -6r

Combine like terms: 15r + -6r = 9r
108 = 9r

Solving
108 = 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.
108 + -9r = 9r + -9r

Combine like terms: 9r + -9r = 0
108 + -9r = 0

Add '-108' to each side of the equation.
108 + -108 + -9r = 0 + -108

Combine like terms: 108 + -108 = 0
0 + -9r = 0 + -108
-9r = 0 + -108

Combine like terms: 0 + -108 = -108
-9r = -108

Divide each side by '-9'.
r = 12

Simplifying
r = 12