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i in (-oo:+oo)
(5*i)/2-(3*i)+4 = 0
(5*i)/2-3*i+4 = 0
4-1/2*i = 0 // - 4
-1/2*i = -4 // : -1/2
i = -4/(-1/2)
i = 8
i = 8
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