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D( i )
8-(6*i) = 0
8-(6*i) = 0
8-(6*i) = 0
8-6*i = 0
8-6*i = 0 // - 8
-6*i = -8 // : -6
i = -8/(-6)
i = 4/3
i in (-oo:4/3) U (4/3:+oo)
(7-(21*i))/(8-(6*i)) = 0
(7-21*i)/(8-6*i) = 0
7-21*i = 0 // - 7
-21*i = -7 // : -21
i = -7/(-21)
i = 1/3
i = 1/3
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