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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-y = 0
1*x^-1 = y // : 1
x^-1 = y
-1 < 0
1/(x^1) = y // * x^1
1 = x^1*y // : y
1/y = x^1
x = 1/y
x = 1/y
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