-2=r+13

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Solution for -2=r+13 equation: 



-2=r+13

We move all terms to the left:

-2-(r+13)=0

We get rid of parentheses

-r-13-2=0

We add all the numbers together, and all the variables

-1r-15=0

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

-r=15

r=15/-1

r=-15

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