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8r=-12+9r
We move all terms to the left:
8r-(-12+9r)=0
We add all the numbers together, and all the variables
8r-(9r-12)=0
We get rid of parentheses
8r-9r+12=0
We add all the numbers together, and all the variables
-1r+12=0
We move all terms containing r to the left, all other terms to the right
-r=-12
r=-12/-1
r=+12
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