9=18-n

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Solution for 9=18-n equation: 



9=18-n

We move all terms to the left:

9-(18-n)=0

We add all the numbers together, and all the variables

-(-1n+18)+9=0

We get rid of parentheses

1n-18+9=0

We add all the numbers together, and all the variables

n-9=0

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

n=9

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