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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(-3) = x-(2/x) // - x-(2/x)
(2*x)/(-3)-x+2/x = 0
2*x^-1-5/3*x^1 = 0
(2*x^0-5/3*x^2)/(x^1) = 0 // * x^2
x^1*(2*x^0-5/3*x^2) = 0
x^1
(-5/3)*x^2+2 = 0
(-5/3)*x^2+2 = 0
DELTA = 0^2-(2*4*(-5/3))
DELTA = 40/3
DELTA > 0
x = ((40/3)^(1/2)+0)/(2*(-5/3)) or x = (0-(40/3)^(1/2))/(2*(-5/3))
x = -3/10*(40/3)^(1/2) or x = 3/10*(40/3)^(1/2)
x in { -3/10*(40/3)^(1/2), 3/10*(40/3)^(1/2)}
x in { -3/10*(40/3)^(1/2), 3/10*(40/3)^(1/2) }
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