13=25-3r

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Solution for 13=25-3r equation: 



13=25-3r

We move all terms to the left:

13-(25-3r)=0

We add all the numbers together, and all the variables

-(-3r+25)+13=0

We get rid of parentheses

3r-25+13=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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