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i in (-oo:+oo)
5*i-((4*i)/8)+4 = 0
(-1/2)*i+5*i+4 = 0
9/2*i+4 = 0 // - 4
9/2*i = -4 // : 9/2
i = -4/9/2
i = -8/9
i = -8/9
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