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4+7r=8r-2
We move all terms to the left:
4+7r-(8r-2)=0
We get rid of parentheses
7r-8r+2+4=0
We add all the numbers together, and all the variables
-1r+6=0
We move all terms containing r to the left, all other terms to the right
-r=-6
r=-6/-1
r=+6
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