-13=2+r+2r

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Solution for -13=2+r+2r equation: 



-13=2+r+2r

We move all terms to the left:

-13-(2+r+2r)=0

We add all the numbers together, and all the variables

-(3r+2)-13=0

We get rid of parentheses

-3r-2-13=0

We add all the numbers together, and all the variables

-3r-15=0

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

-3r=15

r=15/-3

r=-5

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