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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-((5/3)/x)-4 = 0
2*x+(-5/3)*x^-1-4 = 0
2*x^1-5/3*x^-1-4*x^0 = 0
(2*x^2-4*x^1-5/3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-4*x^1-5/3*x^0) = 0
x^1
2*x^2-4*x-5/3 = 0
2*x^2-4*x-5/3 = 0
DELTA = (-4)^2-(2*4*(-5/3))
DELTA = 88/3
DELTA > 0
x = ((88/3)^(1/2)+4)/(2*2) or x = (4-(88/3)^(1/2))/(2*2)
x = ((88/3)^(1/2)+4)/4 or x = (4-(88/3)^(1/2))/4
x in { (4-(88/3)^(1/2))/4, ((88/3)^(1/2)+4)/4}
x in { (4-(88/3)^(1/2))/4, ((88/3)^(1/2)+4)/4 }
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