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