-25=12+r

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Solution for -25=12+r equation: 



-25=12+r

We move all terms to the left:

-25-(12+r)=0

We add all the numbers together, and all the variables

-(r+12)-25=0

We get rid of parentheses

-r-12-25=0

We add all the numbers together, and all the variables

-1r-37=0

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

-r=37

r=37/-1

r=-37

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