-15=13-r

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Solution for -15=13-r equation: 



-15=13-r

We move all terms to the left:

-15-(13-r)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

1r-13-15=0

We add all the numbers together, and all the variables

r-28=0

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

r=28

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