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i in (-oo:+oo)
(2/5)*i+(1/4)*i-1/4+2/5 = 0
13/20*i+3/20 = 0 // - 3/20
13/20*i = -3/20 // : 13/20
i = -3/20/13/20
i = -3/13
i = -3/13
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