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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x-x-(16/x)+4/x-3+3 = 0
5*x-x-16*x^-1+4/x-3+3 = 0
4*x^1-12*x^-1 = 0
(4*x^2-12*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-12*x^0) = 0
x^1
4*x^2-12 = 0
4*x^2-12 = 0
DELTA = 0^2-(-12*4*4)
DELTA = 192
DELTA > 0
x = (192^(1/2)+0)/(2*4) or x = (0-192^(1/2))/(2*4)
x = 3^(1/2) or x = -3^(1/2)
x in { -3^(1/2), 3^(1/2)}
x in { -3^(1/2), 3^(1/2) }
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