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18=4i-1
We move all terms to the left:
18-(4i-1)=0
We get rid of parentheses
-4i+1+18=0
We add all the numbers together, and all the variables
-4i+19=0
We move all terms containing i to the left, all other terms to the right
-4i=-19
i=-19/-4
i=4+3/4
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