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D( i )
3*i-3 = 0
3*i-3 = 0
3*i-3 = 0
3*i-3 = 0 // + 3
3*i = 3 // : 3
i = 3/3
i = 1
i in (-oo:1) U (1:+oo)
(1*i)/(3*i-3)+7 = 0
i/(3*i-3)+7 = 0
i/(3*i-3)+(7*(3*i-3))/(3*i-3) = 0
7*(3*i-3)+i = 0
22*i-21 = 0
(22*i-21)/(3*i-3) = 0
(22*i-21)/(3*i-3) = 0 // * 3*i-3
22*i-21 = 0
22*i-21 = 0 // + 21
22*i = 21 // : 22
i = 21/22
i = 21/22
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