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D( i )
2-(6*i) = 0
2-(6*i) = 0
2-(6*i) = 0
2-6*i = 0
2-6*i = 0 // - 2
-6*i = -2 // : -6
i = -2/(-6)
i = 1/3
i in (-oo:1/3) U (1/3:+oo)
(8-(7*i))/(2-(6*i)) = 0
(8-7*i)/(2-6*i) = 0
8-7*i = 0 // - 8
-7*i = -8 // : -7
i = -8/(-7)
i = 8/7
i = 8/7
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