9r-9=12r

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Solution for 9r-9=12r equation:


Simplifying
9r + -9 = 12r

Reorder the terms:
-9 + 9r = 12r

Solving
-9 + 9r = 12r

Solving for variable 'r'.

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

Add '-12r' to each side of the equation.
-9 + 9r + -12r = 12r + -12r

Combine like terms: 9r + -12r = -3r
-9 + -3r = 12r + -12r

Combine like terms: 12r + -12r = 0
-9 + -3r = 0

Add '9' to each side of the equation.
-9 + 9 + -3r = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -3r = 0 + 9
-3r = 0 + 9

Combine like terms: 0 + 9 = 9
-3r = 9

Divide each side by '-3'.
r = -3

Simplifying
r = -3

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