r+7=13+7r

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



r+7=13+7r

We move all terms to the left:

r+7-(13+7r)=0

We add all the numbers together, and all the variables

r-(7r+13)+7=0

We get rid of parentheses

r-7r-13+7=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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