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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-(1/4) = (3/5)*x // - (3/5)*x
2/x-((3/5)*x)-(1/4) = 0
(-3/5)*x+2/x-1/4 = 0
2*x^-1-3/5*x^1-1/4*x^0 = 0
(2*x^0-3/5*x^2-1/4*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-3/5*x^2-1/4*x^1) = 0
x^1
(-3/5)*x^2+(-1/4)*x+2 = 0
(-3/5)*x^2+(-1/4)*x+2 = 0
DELTA = (-1/4)^2-(2*4*(-3/5))
DELTA = 389/80
DELTA > 0
x = ((389/80)^(1/2)-(-1/4))/(2*(-3/5)) or x = (-(-1/4)-(389/80)^(1/2))/(2*(-3/5))
x = -5/6*((389/80)^(1/2)+1/4) or x = -5/6*(1/4-(389/80)^(1/2))
x in { -5/6*((389/80)^(1/2)+1/4), -5/6*(1/4-(389/80)^(1/2))}
x in { -5/6*((389/80)^(1/2)+1/4), -5/6*(1/4-(389/80)^(1/2)) }
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