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-3+10=2r-10
We move all terms to the left:
-3+10-(2r-10)=0
We add all the numbers together, and all the variables
-(2r-10)+7=0
We get rid of parentheses
-2r+10+7=0
We add all the numbers together, and all the variables
-2r+17=0
We move all terms containing r to the left, all other terms to the right
-2r=-17
r=-17/-2
r=8+1/2
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