13=15-r

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Solution for 13=15-r equation: 



13=15-r

We move all terms to the left:

13-(15-r)=0

We add all the numbers together, and all the variables

-(-1r+15)+13=0

We get rid of parentheses

1r-15+13=0

We add all the numbers together, and all the variables

r-2=0

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

r=2

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