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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