-3(-1+r)=15

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



-3(-1+r)=15

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3(r-1)-15=0

We multiply parentheses

-3r+3-15=0

We add all the numbers together, and all the variables

-3r-12=0

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

-3r=12

r=12/-3

r=-4

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