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