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(7+5i)+(4+-8i)=0
We add all the numbers together, and all the variables
(5i+7)+(-8i)=0
We get rid of parentheses
5i-8i+7=0
We add all the numbers together, and all the variables
-3i+7=0
We move all terms containing i to the left, all other terms to the right
-3i=-7
i=-7/-3
i=2+1/3
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