9=0.12n

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Solution for 9=0.12n equation: 



9=0.12n

We move all terms to the left:

9-(0.12n)=0

We add all the numbers together, and all the variables

-(+0.12n)+9=0

We get rid of parentheses

-0.12n+9=0

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

-0.12n=-9

n=-9/-0.12

n=+75

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