18=i-9

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Solution for 18=i-9 equation: 



18=i-9

We move all terms to the left:

18-(i-9)=0

We get rid of parentheses

-i+9+18=0

We add all the numbers together, and all the variables

-1i+27=0

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

-i=-27

i=-27/-1

i=+27

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