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D( i )
-(10*i)-1 = 0
-(10*i)-1 = 0
-(10*i)-1 = 0
-10*i-1 = 0
-10*i-1 = 0 // + 1
-10*i = 1 // : -10
i = 1/(-10)
i = -1/10
i in (-oo:-1/10) U (-1/10:+oo)
(-(9*i)-6)/(-(10*i)-1) = 0
(-9*i-6)/(-10*i-1) = 0
-9*i-6 = 0 // + 6
-9*i = 6 // : -9
i = 6/(-9)
i = -2/3
i = -2/3
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