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D( i )
-(20*i)-17 = 0
-(20*i)-17 = 0
-(20*i)-17 = 0
-20*i-17 = 0
-20*i-17 = 0 // + 17
-20*i = 17 // : -20
i = 17/(-20)
i = -17/20
i in (-oo:-17/20) U (-17/20:+oo)
(8-(20*i))/(-(20*i)-17) = 0
(8-20*i)/(-20*i-17) = 0
8-20*i = 0 // - 8
-20*i = -8 // : -20
i = -8/(-20)
i = 2/5
i = 2/5
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