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6r-7=13+7r
We move all terms to the left:
6r-7-(13+7r)=0
We add all the numbers together, and all the variables
6r-(7r+13)-7=0
We get rid of parentheses
6r-7r-13-7=0
We add all the numbers together, and all the variables
-1r-20=0
We move all terms containing r to the left, all other terms to the right
-r=20
r=20/-1
r=-20
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