-12=13+r

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Solution for -12=13+r equation: 



-12=13+r

We move all terms to the left:

-12-(13+r)=0

We add all the numbers together, and all the variables

-(r+13)-12=0

We get rid of parentheses

-r-13-12=0

We add all the numbers together, and all the variables

-1r-25=0

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

-r=25

r=25/-1

r=-25

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