-15=5+3r-2

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Solution for -15=5+3r-2 equation: 



-15=5+3r-2

We move all terms to the left:

-15-(5+3r-2)=0

We add all the numbers together, and all the variables

-(3r+3)-15=0

We get rid of parentheses

-3r-3-15=0

We add all the numbers together, and all the variables

-3r-18=0

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

-3r=18

r=18/-3

r=-6

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