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-40=4i+4i
We move all terms to the left:
-40-(4i+4i)=0
We add all the numbers together, and all the variables
-(+8i)-40=0
We get rid of parentheses
-8i-40=0
We move all terms containing i to the left, all other terms to the right
-8i=40
i=40/-8
i=-5
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