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