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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-x = 7/3 // - 7/3
1/x-x-(7/3) = 0
1/x-x-7/3 = 0
1*x^-1-1*x^1-7/3*x^0 = 0
(1*x^0-1*x^2-7/3*x^1)/(x^1) = 0 // * x^2
x^1*(1*x^0-1*x^2-7/3*x^1) = 0
x^1
(-7/3)*x-x^2+1 = 0
(-7/3)*x-x^2+1 = 0
DELTA = (-7/3)^2-(-1*1*4)
DELTA = 85/9
DELTA > 0
x = ((85/9)^(1/2)-(-7/3))/(-1*2) or x = (-(-7/3)-(85/9)^(1/2))/(-1*2)
x = ((85/9)^(1/2)+7/3)/(-2) or x = (7/3-(85/9)^(1/2))/(-2)
x in { ((85/9)^(1/2)+7/3)/(-2), (7/3-(85/9)^(1/2))/(-2)}
x in { ((85/9)^(1/2)+7/3)/(-2), (7/3-(85/9)^(1/2))/(-2) }
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