-63=7r+7

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Solution for -63=7r+7 equation: 



-63=7r+7

We move all terms to the left:

-63-(7r+7)=0

We get rid of parentheses

-7r-7-63=0

We add all the numbers together, and all the variables

-7r-70=0

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

-7r=70

r=70/-7

r=-10

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