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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(X^5-1)/(x-1) = 121 // - 121
(X^5-1)/(x-1)-121 = 0
(X^5-1)/(x-1)+(-121*(x-1))/(x-1) = 0
X^5-121*(x-1)-1 = 0
X^5-121*x+120 = 0
(X^5-121*x+120)/(x-1) = 0
(X^5-121*x+120)/(x-1) = 0 // * x-1
X^5-121*x+120 = 0
X^5-121*x+120 = 0 // - X^5+120
-121*x = -(X^5+120) // : -121
x = (-(X^5+120))/(-121)
x = (X^5+120)/121
x = (X^5+120)/121
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