-15=2r-5+8r

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Solution for -15=2r-5+8r equation: 



-15=2r-5+8r

We move all terms to the left:

-15-(2r-5+8r)=0

We add all the numbers together, and all the variables

-(10r-5)-15=0

We get rid of parentheses

-10r+5-15=0

We add all the numbers together, and all the variables

-10r-10=0

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

-10r=10

r=10/-10

r=-1

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