-15=2r+

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Solution for -15=2r+ equation: 



-15=2r+

We move all terms to the left:

-15-(2r+)=0

We add all the numbers together, and all the variables

-(+2r)-15=0

We get rid of parentheses

-2r-15=0

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

-2r=15

r=15/-2

r=-7+1/2

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