Solve for r
r=-1
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84-12r=96
Swap sides so that all variable terms are on the left hand side.
-12r=96-84
Subtract 84 from both sides.
-12r=12
Subtract 84 from 96 to get 12.
r=\frac{12}{-12}
Divide both sides by -12.
r=-1
Divide 12 by -12 to get -1.
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