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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+4 = (5/3)*x+25/6 // - (5/3)*x+25/6
2/x-((5/3)*x)-(25/6)+4 = 0
(-5/3)*x+2/x-25/6+4 = 0
2*x^-1-5/3*x^1-1/6*x^0 = 0
(2*x^0-5/3*x^2-1/6*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-5/3*x^2-1/6*x^1) = 0
x^1
(-5/3)*x^2+(-1/6)*x+2 = 0
(-5/3)*x^2+(-1/6)*x+2 = 0
DELTA = (-1/6)^2-(2*4*(-5/3))
DELTA = 481/36
DELTA > 0
x = ((481/36)^(1/2)-(-1/6))/(2*(-5/3)) or x = (-(-1/6)-(481/36)^(1/2))/(2*(-5/3))
x = -3/10*((481/36)^(1/2)+1/6) or x = -3/10*(1/6-(481/36)^(1/2))
x in { -3/10*((481/36)^(1/2)+1/6), -3/10*(1/6-(481/36)^(1/2))}
x in { -3/10*((481/36)^(1/2)+1/6), -3/10*(1/6-(481/36)^(1/2)) }
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