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