r+7=13+4r

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Solution for r+7=13+4r equation: 



r+7=13+4r

We move all terms to the left:

r+7-(13+4r)=0

We add all the numbers together, and all the variables

r-(4r+13)+7=0

We get rid of parentheses

r-4r-13+7=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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