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