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i in (-oo:+oo)
3*i-((2*i)/5)+4 = 0
(-2/5)*i+3*i+4 = 0
13/5*i+4 = 0 // - 4
13/5*i = -4 // : 13/5
i = -4/13/5
i = -20/13
i = -20/13
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