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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-1/x = (-7/3)*x-2 // - (-7/3)*x-2
2-((-7/3)*x)-1/x = 0
(7/3)*x-1/x+2 = 0
7/3*x^1-1*x^-1+2*x^0 = 0
(7/3*x^2+2*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(7/3*x^2+2*x^1-1*x^0) = 0
x^1
(7/3)*x^2+2*x-1 = 0
(7/3)*x^2+2*x-1 = 0
DELTA = 2^2-(-1*4*(7/3))
DELTA = 40/3
DELTA > 0
x = ((40/3)^(1/2)-2)/(2*(7/3)) or x = (-(40/3)^(1/2)-2)/(2*(7/3))
x = 3/14*((40/3)^(1/2)-2) or x = -3/14*((40/3)^(1/2)+2)
x in { -3/14*((40/3)^(1/2)+2), 3/14*((40/3)^(1/2)-2)}
x in { -3/14*((40/3)^(1/2)+2), 3/14*((40/3)^(1/2)-2) }
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