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10=3r-7+5r
We move all terms to the left:
10-(3r-7+5r)=0
We add all the numbers together, and all the variables
-(8r-7)+10=0
We get rid of parentheses
-8r+7+10=0
We add all the numbers together, and all the variables
-8r+17=0
We move all terms containing r to the left, all other terms to the right
-8r=-17
r=-17/-8
r=2+1/8
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