12=i-9

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Solution for 12=i-9 equation: 



12=i-9

We move all terms to the left:

12-(i-9)=0

We get rid of parentheses

-i+9+12=0

We add all the numbers together, and all the variables

-1i+21=0

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

-i=-21

i=-21/-1

i=+21

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