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D( i )
6-(19*i) = 0
6-(19*i) = 0
6-(19*i) = 0
6-19*i = 0
6-19*i = 0 // - 6
-19*i = -6 // : -19
i = -6/(-19)
i = 6/19
i in (-oo:6/19) U (6/19:+oo)
(6-(3*i))/(6-(19*i)) = 0
(6-3*i)/(6-19*i) = 0
6-3*i = 0 // - 6
-3*i = -6 // : -3
i = -6/(-3)
i = 2
i = 2
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