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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/5)*x = 3-(1/x) // - 3-(1/x)
(1/5)*x+1/x-3 = 0
1/5*x^1+1*x^-1-3*x^0 = 0
(1/5*x^2-3*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1/5*x^2-3*x^1+1*x^0) = 0
x^1
(1/5)*x^2-3*x+1 = 0
(1/5)*x^2-3*x+1 = 0
DELTA = (-3)^2-(1*4*(1/5))
DELTA = 41/5
DELTA > 0
x = ((41/5)^(1/2)+3)/(2*(1/5)) or x = (3-(41/5)^(1/2))/(2*(1/5))
x = 5/2*((41/5)^(1/2)+3) or x = 5/2*(3-(41/5)^(1/2))
x in { 5/2*(3-(41/5)^(1/2)), 5/2*((41/5)^(1/2)+3)}
x in { 5/2*(3-(41/5)^(1/2)), 5/2*((41/5)^(1/2)+3) }
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