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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
685/I = 85 // - 85
685/I-85 = 0
685*I^-1 = 85 // : 685
I^-1 = 17/137
-1 < 0
1/(I^1) = 17/137 // * I^1
1 = 17/137*I^1 // : 17/137
137/17 = I^1
I = 137/17
I = 137/17
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