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i in (-oo:+oo)
3-((6*i)/4)-(5*i) = 0
(-3/2)*i-5*i+3 = 0
3-13/2*i = 0 // - 3
-13/2*i = -3 // : -13/2
i = -3/(-13/2)
i = 6/13
i = 6/13
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