-108=9(9r-3)

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Solution for -108=9(9r-3) equation: 


Simplifying
-108 = 9(9r + -3)

Reorder the terms:
-108 = 9(-3 + 9r)
-108 = (-3 * 9 + 9r * 9)
-108 = (-27 + 81r)

Solving
-108 = -27 + 81r

Solving for variable 'r'.

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

Add '-81r' to each side of the equation.
-108 + -81r = -27 + 81r + -81r

Combine like terms: 81r + -81r = 0
-108 + -81r = -27 + 0
-108 + -81r = -27

Add '108' to each side of the equation.
-108 + 108 + -81r = -27 + 108

Combine like terms: -108 + 108 = 0
0 + -81r = -27 + 108
-81r = -27 + 108

Combine like terms: -27 + 108 = 81
-81r = 81

Divide each side by '-81'.
r = -1

Simplifying
r = -1

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