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i in (-oo:+oo)
5-((4*i)/8)-(3*i) = 0
(-1/2)*i-3*i+5 = 0
5-7/2*i = 0 // - 5
-7/2*i = -5 // : -7/2
i = -5/(-7/2)
i = 10/7
i = 10/7
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