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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/3)*x = 4/x-2 // - 4/x-2
(7/3)*x-(4/x)+2 = 0
(7/3)*x-4*x^-1+2 = 0
7/3*x^1-4*x^-1+2*x^0 = 0
(7/3*x^2+2*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(7/3*x^2+2*x^1-4*x^0) = 0
x^1
(7/3)*x^2+2*x-4 = 0
(7/3)*x^2+2*x-4 = 0
DELTA = 2^2-(-4*4*(7/3))
DELTA = 124/3
DELTA > 0
x = ((124/3)^(1/2)-2)/(2*(7/3)) or x = (-(124/3)^(1/2)-2)/(2*(7/3))
x = 3/14*((124/3)^(1/2)-2) or x = -3/14*((124/3)^(1/2)+2)
x in { -3/14*((124/3)^(1/2)+2), 3/14*((124/3)^(1/2)-2)}
x in { -3/14*((124/3)^(1/2)+2), 3/14*((124/3)^(1/2)-2) }
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