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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+1/x-1 = 6/x // - 6/x
X+1/x-(6/x)-1 = 0
X+1/x-6*x^-1-1 = 0
-5*x^-1 = -(X-1) // : -5
x^-1 = (1-X)/(-5)
-1 < 0
1/(x^1) = (1-X)/(-5) // * x^1
1 = x^1*((1-X)/(-5)) // : (1-X)/(-5)
-5*(1-X)^-1 = x^1
x = -5*(1-X)^-1
x = -5*(1-X)^-1
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