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i in (-oo:+oo)
3*i-(4/5) = -4 // + 4
3*i-(4/5)+4 = 0
3*i-4/5+4 = 0
3*i+16/5 = 0 // - 16/5
3*i = -16/5 // : 3
i = -16/5/3
i = -16/15
i = -16/15
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