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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(-4/3)*x+6/x-1+2 = 1 // - 1
(-4/3)*x+6/x-1-1+2 = 0
6*x^-1-4/3*x^1 = 0
(6*x^0-4/3*x^2)/(x^1) = 0 // * x^2
x^1*(6*x^0-4/3*x^2) = 0
x^1
(-4/3)*x^2+6 = 0
(-4/3)*x^2+6 = 0
DELTA = 0^2-(4*6*(-4/3))
DELTA = 32
DELTA > 0
x = (32^(1/2)+0)/(2*(-4/3)) or x = (0-32^(1/2))/(2*(-4/3))
x = -3/2*2^(1/2) or x = 3/2*2^(1/2)
x in { -3/2*2^(1/2), 3/2*2^(1/2)}
x in { -3/2*2^(1/2), 3/2*2^(1/2) }
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