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80=5r+5r
We move all terms to the left:
80-(5r+5r)=0
We add all the numbers together, and all the variables
-(+10r)+80=0
We get rid of parentheses
-10r+80=0
We move all terms containing r to the left, all other terms to the right
-10r=-80
r=-80/-10
r=+8
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