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D( x )
x^2-(10*x)+27 = 0
x^2-(10*x)+27 = 0
x^2-(10*x)+27 = 0
x^2-10*x+27 = 0
x^2-10*x+27 = 0
DELTA = (-10)^2-(1*4*27)
DELTA = -8
DELTA < 0
x in (-oo:+oo)
(x-4)/(x^2-(10*x)+27) = 0
(x-4)/(x^2-10*x+27) = 0
x^2-10*x+27 = 0
x^2-10*x+27 = 0
DELTA = (-10)^2-(1*4*27)
DELTA = -8
DELTA < 0
1 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x = 4
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