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96=-9r-3r
We move all terms to the left:
96-(-9r-3r)=0
We add all the numbers together, and all the variables
-(-12r)+96=0
We get rid of parentheses
12r+96=0
We move all terms containing r to the left, all other terms to the right
12r=-96
r=-96/12
r=-8
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