-13=1-7r+7

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Solution for -13=1-7r+7 equation: 



-13=1-7r+7

We move all terms to the left:

-13-(1-7r+7)=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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