-9=+2n

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Solution for -9=+2n equation: 



-9=+2n

We move all terms to the left:

-9-(+2n)=0

We get rid of parentheses

-2n-9=0

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

-2n=9

n=9/-2

n=-4+1/2

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