-12=3(-5+r)

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Solution for -12=3(-5+r) equation: 



-12=3(-5+r)

We move all terms to the left:

-12-(3(-5+r))=0

We add all the numbers together, and all the variables

-(3(r-5))-12=0



We calculate terms in parentheses: -(3(r-5)), so:

3(r-5)

We multiply parentheses

3r-15

Back to the equation:

-(3r-15)



We get rid of parentheses

-3r+15-12=0

We add all the numbers together, and all the variables

-3r+3=0

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

-3r=-3

r=-3/-3

r=1

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