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i in (-oo:+oo)
(2*i)/(-2)-(5*i)+3 = 0
(2*i)/(-2)-5*i+3 = 0
3-6*i = 0 // - 3
-6*i = -3 // : -6
i = -3/(-6)
i = 1/2
i = 1/2
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