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(12+6i)=
We move all terms to the left:
(12+6i)-()=0
We add all the numbers together, and all the variables
(6i+12)-()=0
We add all the numbers together, and all the variables
(6i+12)=0
We get rid of parentheses
6i+12=0
We move all terms containing i to the left, all other terms to the right
6i=-12
i=-12/6
i=-2
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