-13=8+7r

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Solution for -13=8+7r equation: 



-13=8+7r

We move all terms to the left:

-13-(8+7r)=0

We add all the numbers together, and all the variables

-(7r+8)-13=0

We get rid of parentheses

-7r-8-13=0

We add all the numbers together, and all the variables

-7r-21=0

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

-7r=21

r=21/-7

r=-3

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