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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
12/I = 14/3.5 // - 14/3.5
12/I-(14/3.5) = 0
12/I-4 = 0
12*I^-1 = 4 // : 12
I^-1 = 1/3
-1 < 0
1/(I^1) = 1/3 // * I^1
1 = 1/3*I^1 // : 1/3
3 = I^1
I = 3
I = 3
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