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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-((5/3)*x)-4 = x+10/x+6 // - x+10/x+6
4*x-((5/3)*x)-x-(10/x)-6-4 = 0
4*x+(-5/3)*x-x-10*x^-1-6-4 = 0
4/3*x^1-10*x^-1-10*x^0 = 0
(4/3*x^2-10*x^1-10*x^0)/(x^1) = 0 // * x^2
x^1*(4/3*x^2-10*x^1-10*x^0) = 0
x^1
(4/3)*x^2-10*x-10 = 0
(4/3)*x^2-10*x-10 = 0
DELTA = (-10)^2-(-10*4*(4/3))
DELTA = 460/3
DELTA > 0
x = ((460/3)^(1/2)+10)/(2*(4/3)) or x = (10-(460/3)^(1/2))/(2*(4/3))
x = 3/8*((460/3)^(1/2)+10) or x = 3/8*(10-(460/3)^(1/2))
x in { 3/8*(10-(460/3)^(1/2)), 3/8*((460/3)^(1/2)+10)}
x in { 3/8*(10-(460/3)^(1/2)), 3/8*((460/3)^(1/2)+10) }
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