-15=3(6+r)

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Solution for -15=3(6+r) equation: 



-15=3(6+r)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3(r+6)), so:

3(r+6)

We multiply parentheses

3r+18

Back to the equation:

-(3r+18)



We get rid of parentheses

-3r-18-15=0

We add all the numbers together, and all the variables

-3r-33=0

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

-3r=33

r=33/-3

r=-11

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