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