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9i+18=3i-6
We move all terms to the left:
9i+18-(3i-6)=0
We get rid of parentheses
9i-3i+6+18=0
We add all the numbers together, and all the variables
6i+24=0
We move all terms containing i to the left, all other terms to the right
6i=-24
i=-24/6
i=-4
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