-n-2n=-18

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Solution for -n-2n=-18 equation: 



-n-2n=-18

We move all terms to the left:

-n-2n-(-18)=0

We add all the numbers together, and all the variables

-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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