13=3r+7

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Solution for 13=3r+7 equation: 



13=3r+7

We move all terms to the left:

13-(3r+7)=0

We get rid of parentheses

-3r-7+13=0

We add all the numbers together, and all the variables

-3r+6=0

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

-3r=-6

r=-6/-3

r=+2

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