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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
66/I = 2/3 // - 2/3
66/I-(2/3) = 0
66/I-2/3 = 0
66*I^-1 = 2/3 // : 66
I^-1 = 1/99
-1 < 0
1/(I^1) = 1/99 // * I^1
1 = 1/99*I^1 // : 1/99
99 = I^1
I = 99
I = 99
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