13=7r-8

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Solution for 13=7r-8 equation: 



13=7r-8

We move all terms to the left:

13-(7r-8)=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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