r+13=7r-5

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Solution for r+13=7r-5 equation: 



r+13=7r-5

We move all terms to the left:

r+13-(7r-5)=0

We get rid of parentheses

r-7r+5+13=0

We add all the numbers together, and all the variables

-6r+18=0

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

-6r=-18

r=-18/-6

r=+3

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