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-18-10r=-8r+12
We move all terms to the left:
-18-10r-(-8r+12)=0
We get rid of parentheses
-10r+8r-12-18=0
We add all the numbers together, and all the variables
-2r-30=0
We move all terms containing r to the left, all other terms to the right
-2r=30
r=30/-2
r=-15
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