-9=4n+5n

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Solution for -9=4n+5n equation: 



-9=4n+5n

We move all terms to the left:

-9-(4n+5n)=0

We add all the numbers together, and all the variables

-(+9n)-9=0

We get rid of parentheses

-9n-9=0

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

-9n=9

n=9/-9

n=-1

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