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-8r-3=-7r-10
We move all terms to the left:
-8r-3-(-7r-10)=0
We get rid of parentheses
-8r+7r+10-3=0
We add all the numbers together, and all the variables
-1r+7=0
We move all terms containing r to the left, all other terms to the right
-r=-7
r=-7/-1
r=+7
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