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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+25/x-10 = 0
1*x^1+25*x^-1-10*x^0 = 0
(1*x^2-10*x^1+25*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-10*x^1+25*x^0) = 0
x^1
x^2-10*x+25 = 0
x^2-10*x+25 = 0
DELTA = (-10)^2-(1*4*25)
DELTA = 0
x = 10/(1*2)
x = 5 or x = 5
x in { 5, 5}
x in { 5, 5 }
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