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8=r+3r
We move all terms to the left:
8-(r+3r)=0
We add all the numbers together, and all the variables
-(+4r)+8=0
We get rid of parentheses
-4r+8=0
We move all terms containing r to the left, all other terms to the right
-4r=-8
r=-8/-4
r=+2
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