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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-(5/3) = x/6 // - x/6
4/x-(x/6)-(5/3) = 0
4/x-(x/6)-5/3 = 0
4*x^-1-1/6*x^1-5/3*x^0 = 0
(4*x^0-1/6*x^2-5/3*x^1)/(x^1) = 0 // * x^2
x^1*(4*x^0-1/6*x^2-5/3*x^1) = 0
x^1
(-1/6)*x^2+(-5/3)*x+4 = 0
(-1/6)*x^2+(-5/3)*x+4 = 0
DELTA = (-5/3)^2-(4*4*(-1/6))
DELTA = 49/9
DELTA > 0
x = ((49/9)^(1/2)-(-5/3))/(2*(-1/6)) or x = (-(-5/3)-(49/9)^(1/2))/(2*(-1/6))
x = -12 or x = 2
x in { -12, 2}
x in { -12, 2 }
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