-12=3(r-15)-15

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Solution for -12=3(r-15)-15 equation: 



-12=3(r-15)-15

We move all terms to the left:

-12-(3(r-15)-15)=0



We calculate terms in parentheses: -(3(r-15)-15), so:

3(r-15)-15

We multiply parentheses

3r-45-15

We add all the numbers together, and all the variables

3r-60

Back to the equation:

-(3r-60)



We get rid of parentheses

-3r+60-12=0

We add all the numbers together, and all the variables

-3r+48=0

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

-3r=-48

r=-48/-3

r=+16

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