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