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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(3*x^2+5*x+50)/(x-5) = 0
3*x^2+5*x+50 = 0
3*x^2+5*x+50 = 0
DELTA = 5^2-(3*4*50)
DELTA = -575
DELTA < 0
1 = 0
1/(x-5) = 0
x belongs to the empty set
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