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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2-(1/x) = (1/5)*x // - (1/5)*x
2-((1/5)*x)-(1/x) = 0
(-1/5)*x-x^-1+2 = 0
2*x^0-1/5*x^1-1*x^-1 = 0
(2*x^1-1/5*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^1-1/5*x^2-1*x^0) = 0
x^1
(-1/5)*x^2+2*x-1 = 0
(-1/5)*x^2+2*x-1 = 0
DELTA = 2^2-(-1*4*(-1/5))
DELTA = 16/5
DELTA > 0
x = ((16/5)^(1/2)-2)/(2*(-1/5)) or x = (-(16/5)^(1/2)-2)/(2*(-1/5))
x = -5/2*((16/5)^(1/2)-2) or x = 5/2*((16/5)^(1/2)+2)
x in { -5/2*((16/5)^(1/2)-2), 5/2*((16/5)^(1/2)+2)}
x in { -5/2*((16/5)^(1/2)-2), 5/2*((16/5)^(1/2)+2) }
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