13=6r+7

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Solution for 13=6r+7 equation: 



13=6r+7

We move all terms to the left:

13-(6r+7)=0

We get rid of parentheses

-6r-7+13=0

We add all the numbers together, and all the variables

-6r+6=0

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

-6r=-6

r=-6/-6

r=1

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