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D( I )
I = 0
I = 0
I = 0
I in (-oo:0) U (0:+oo)
14/I = 42/45 // - 42/45
14/I-(42/45) = 0
14/I-14/15 = 0
14*I^-1 = 14/15 // : 14
I^-1 = 1/15
-1 < 0
1/(I^1) = 1/15 // * I^1
1 = 1/15*I^1 // : 1/15
15 = I^1
I = 15
I = 15
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