12=-3(1-5r)

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Solution for 12=-3(1-5r) equation: 



12=-3(1-5r)

We move all terms to the left:

12-(-3(1-5r))=0

We add all the numbers together, and all the variables

-(-3(-5r+1))+12=0



We calculate terms in parentheses: -(-3(-5r+1)), so:

-3(-5r+1)

We multiply parentheses

15r-3

Back to the equation:

-(15r-3)



We get rid of parentheses

-15r+3+12=0

We add all the numbers together, and all the variables

-15r+15=0

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

-15r=-15

r=-15/-15

r=1

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