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i in (-oo:+oo)
(9/5)*i+(1/4)*i+1/4+2/5 = 0
41/20*i+13/20 = 0 // - 13/20
41/20*i = -13/20 // : 41/20
i = -13/20/41/20
i = -13/41
i = -13/41
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