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(15+7i)-(5+2i)=0
We add all the numbers together, and all the variables
(7i+15)-(2i+5)=0
We get rid of parentheses
7i-2i+15-5=0
We add all the numbers together, and all the variables
5i+10=0
We move all terms containing i to the left, all other terms to the right
5i=-10
i=-10/5
i=-2
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