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-9r+3=-8r
We move all terms to the left:
-9r+3-(-8r)=0
We get rid of parentheses
-9r+8r+3=0
We add all the numbers together, and all the variables
-1r+3=0
We move all terms containing r to the left, all other terms to the right
-r=-3
r=-3/-1
r=+3
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