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4i+3=12.2
We move all terms to the left:
4i+3-(12.2)=0
We add all the numbers together, and all the variables
4i-9.2=0
We move all terms containing i to the left, all other terms to the right
4i=9.2
i=9.2/4
i=2+1/3.3333333333333
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