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15=2i+0
We move all terms to the left:
15-(2i+0)=0
We add all the numbers together, and all the variables
-(+2i)+15=0
We get rid of parentheses
-2i+15=0
We move all terms containing i to the left, all other terms to the right
-2i=-15
i=-15/-2
i=7+1/2
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