9r-12r=12

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Solution for 9r-12r=12 equation: 


Simplifying
9r + -12r = 12

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

Solving
-3r = 12

Solving for variable 'r'.

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

Divide each side by '-3'.
r = -4

Simplifying
r = -4

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