12=i+3

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Solution for 12=i+3 equation: 



12=i+3

We move all terms to the left:

12-(i+3)=0

We get rid of parentheses

-i-3+12=0

We add all the numbers together, and all the variables

-1i+9=0

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

-i=-9

i=-9/-1

i=+9

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