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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/7)*x+2/x = 2 // - 2
(2/7)*x+2/x-2 = 0
2/7*x^1+2*x^-1-2*x^0 = 0
(2/7*x^2-2*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(2/7*x^2-2*x^1+2*x^0) = 0
x^1
(2/7)*x^2-2*x+2 = 0
(2/7)*x^2-2*x+2 = 0
DELTA = (-2)^2-(2*4*(2/7))
DELTA = 12/7
DELTA > 0
x = ((12/7)^(1/2)+2)/(2*(2/7)) or x = (2-(12/7)^(1/2))/(2*(2/7))
x = 7/4*((12/7)^(1/2)+2) or x = 7/4*(2-(12/7)^(1/2))
x in { 7/4*(2-(12/7)^(1/2)), 7/4*((12/7)^(1/2)+2)}
x in { 7/4*(2-(12/7)^(1/2)), 7/4*((12/7)^(1/2)+2) }
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