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(7-10i)-(3+30i)=0
We add all the numbers together, and all the variables
(-10i+7)-(30i+3)=0
We get rid of parentheses
-10i-30i+7-3=0
We add all the numbers together, and all the variables
-40i+4=0
We move all terms containing i to the left, all other terms to the right
-40i=-4
i=-4/-40
i=1/10
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