72=-r+7r

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Solution for 72=-r+7r equation: 



72=-r+7r

We move all terms to the left:

72-(-r+7r)=0

We add all the numbers together, and all the variables

-(+6r)+72=0

We get rid of parentheses

-6r+72=0

We move all terms containing r to the left, all other terms to the right

-6r=-72

r=-72/-6

r=+12

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