-3(n-1)=15

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Solution for -3(n-1)=15 equation: 



-3(n-1)=15

We move all terms to the left:

-3(n-1)-(15)=0

We multiply parentheses

-3n+3-15=0

We add all the numbers together, and all the variables

-3n-12=0

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

-3n=12

n=12/-3

n=-4

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