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