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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-4 = x/3 // - x/3
2/x-(x/3)-4 = 0
2*x^-1-1/3*x^1-4*x^0 = 0
(2*x^0-1/3*x^2-4*x^1)/(x^1) = 0 // * x^2
x^1*(2*x^0-1/3*x^2-4*x^1) = 0
x^1
(-1/3)*x^2-4*x+2 = 0
(-1/3)*x^2-4*x+2 = 0
DELTA = (-4)^2-(2*4*(-1/3))
DELTA = 56/3
DELTA > 0
x = ((56/3)^(1/2)+4)/(2*(-1/3)) or x = (4-(56/3)^(1/2))/(2*(-1/3))
x = -3/2*((56/3)^(1/2)+4) or x = -3/2*(4-(56/3)^(1/2))
x in { -3/2*((56/3)^(1/2)+4), -3/2*(4-(56/3)^(1/2))}
x in { -3/2*((56/3)^(1/2)+4), -3/2*(4-(56/3)^(1/2)) }
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