25=2r+13

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Solution for 25=2r+13 equation: 



25=2r+13

We move all terms to the left:

25-(2r+13)=0

We get rid of parentheses

-2r-13+25=0

We add all the numbers together, and all the variables

-2r+12=0

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

-2r=-12

r=-12/-2

r=+6

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