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-12=r/9+8
We move all terms to the left:
-12-(r/9+8)=0
We get rid of parentheses
-r/9-8-12=0
We multiply all the terms by the denominator
-r-8*9-12*9=0
We add all the numbers together, and all the variables
-1r-180=0
We move all terms containing r to the left, all other terms to the right
-r=180
r=180/-1
r=-180
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