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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/3)*x = 6/x-3 // - 6/x-3
(2/3)*x-(6/x)+3 = 0
(2/3)*x-6*x^-1+3 = 0
2/3*x^1-6*x^-1+3*x^0 = 0
(2/3*x^2+3*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2+3*x^1-6*x^0) = 0
x^1
(2/3)*x^2+3*x-6 = 0
(2/3)*x^2+3*x-6 = 0
DELTA = 3^2-(-6*4*(2/3))
DELTA = 25
DELTA > 0
x = (25^(1/2)-3)/(2*(2/3)) or x = (-25^(1/2)-3)/(2*(2/3))
x = 3/2 or x = -6
x in { -6, 3/2}
x in { -6, 3/2 }
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