-11=r+15

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Solution for -11=r+15 equation: 



-11=r+15

We move all terms to the left:

-11-(r+15)=0

We get rid of parentheses

-r-15-11=0

We add all the numbers together, and all the variables

-1r-26=0

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

-r=26

r=26/-1

r=-26

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