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