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