-15=6-3r

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Solution for -15=6-3r equation: 



-15=6-3r

We move all terms to the left:

-15-(6-3r)=0

We add all the numbers together, and all the variables

-(-3r+6)-15=0

We get rid of parentheses

3r-6-15=0

We add all the numbers together, and all the variables

3r-21=0

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

3r=21

r=21/3

r=7

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