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i in (-oo:+oo)
3-((2*i)/4)-(3*i) = 0
(-1/2)*i-3*i+3 = 0
3-7/2*i = 0 // - 3
-7/2*i = -3 // : -7/2
i = -3/(-7/2)
i = 6/7
i = 6/7
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