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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(25*x)/x = 5*x // - 5*x
(25*x)/x-(5*x) = 0
(25*x)/x-5*x = 0
25-5*x = 0 // - 25
-5*x = -25 // : -5
x = -25/(-5)
x = 5
x = 5
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