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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/5+25/x = 2*x-1 // - 2*x-1
(4*x)/5-(2*x)+25/x+1 = 0
(4*x)/5-2*x+25/x+1 = 0
25*x^-1-6/5*x^1+1*x^0 = 0
(1*x^1-6/5*x^2+25*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^1-6/5*x^2+25*x^0) = 0
x^1
(-6/5)*x^2+x+25 = 0
(-6/5)*x^2+x+25 = 0
DELTA = 1^2-(4*25*(-6/5))
DELTA = 121
DELTA > 0
x = (121^(1/2)-1)/(2*(-6/5)) or x = (-121^(1/2)-1)/(2*(-6/5))
x = -25/6 or x = 5
x in { -25/6, 5}
x in { -25/6, 5 }
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