15=-3(2r-1)

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Solution for 15=-3(2r-1) equation: 



15=-3(2r-1)

We move all terms to the left:

15-(-3(2r-1))=0



We calculate terms in parentheses: -(-3(2r-1)), so:

-3(2r-1)

We multiply parentheses

-6r+3

Back to the equation:

-(-6r+3)



We get rid of parentheses

6r-3+15=0

We add all the numbers together, and all the variables

6r+12=0

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

6r=-12

r=-12/6

r=-2

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