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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
7/8 = 56/I // - 56/I
7/8-(56/I) = 0
7/8-56*I^-1 = 0
-56*I^-1 = -7/8 // : -56
I^-1 = 1/64
-1 < 0
1/(I^1) = 1/64 // * I^1
1 = 1/64*I^1 // : 1/64
64 = I^1
I = 64
I = 64
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