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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/5)*x-(2/x)+1/5 = 0
(3/5)*x-2*x^-1+1/5 = 0
3/5*x^1-2*x^-1+1/5*x^0 = 0
(3/5*x^2+1/5*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(3/5*x^2+1/5*x^1-2*x^0) = 0
x^1
(3/5)*x^2+(1/5)*x-2 = 0
(3/5)*x^2+(1/5)*x-2 = 0
DELTA = (1/5)^2-(-2*4*(3/5))
DELTA = 121/25
DELTA > 0
x = ((121/25)^(1/2)-(1/5))/(2*(3/5)) or x = (-(1/5)-(121/25)^(1/2))/(2*(3/5))
x = 5/3 or x = -2
x in { -2, 5/3}
x in { -2, 5/3 }
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