25=r+12

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Solution for 25=r+12 equation: 



25=r+12

We move all terms to the left:

25-(r+12)=0

We get rid of parentheses

-r-12+25=0

We add all the numbers together, and all the variables

-1r+13=0

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

-r=-13

r=-13/-1

r=+13

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