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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(3/x)-6 = 0
2*x-3*x^-1-6 = 0
2*x^1-3*x^-1-6*x^0 = 0
(2*x^2-6*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-6*x^1-3*x^0) = 0
x^1
2*x^2-6*x-3 = 0
2*x^2-6*x-3 = 0
DELTA = (-6)^2-(-3*2*4)
DELTA = 60
DELTA > 0
x = (60^(1/2)+6)/(2*2) or x = (6-60^(1/2))/(2*2)
x = (2*15^(1/2)+6)/4 or x = (6-2*15^(1/2))/4
x in { (6-2*15^(1/2))/4, (2*15^(1/2)+6)/4}
x in { (6-2*15^(1/2))/4, (2*15^(1/2)+6)/4 }
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