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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
12 = 6/I // - 6/I
12-(6/I) = 0
12-6*I^-1 = 0
-6*I^-1 = -12 // : -6
I^-1 = 2
-1 < 0
1/(I^1) = 2 // * I^1
1 = 2*I^1 // : 2
1/2 = I^1
I = 1/2
I = 1/2
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