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i in (-oo:+oo)
3-((2.5*i)/5)-(3.5*i) = 0
3-0.5*i-3.5*i = 0
3-4*i = 0 // - 3
-4*i = -3 // : -4
i = -3/(-4)
i = 3/4
i = 3/4
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