-3(n+-)=18

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Solution for -3(n+-)=18 equation: 



-3(n+-)=18

We move all terms to the left:

-3(n+-)-(18)=0

We add all the numbers together, and all the variables

-3(+n)-18=0

We multiply parentheses

-3n-18=0

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

-3n=18

n=18/-3

n=-6

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