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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/2+x/x-3 = ((6*x)/2)*x-6 // - ((6*x)/2)*x-6
x/2-(((6*x)/2)*x)+x/x-3+6 = 0
x/2-3*x^2+x/x-3+6 = 0
1/2*x-3*x^2+4 = 0
DELTA = (1/2)^2-(-3*4*4)
DELTA = 193/4
DELTA > 0
x = ((193/4)^(1/2)-1/2)/(-3*2) or x = (-(193/4)^(1/2)-1/2)/(-3*2)
x = ((193/4)^(1/2)-1/2)/(-6) or x = ((193/4)^(1/2)+1/2)/6
x in { ((193/4)^(1/2)-1/2)/(-6), ((193/4)^(1/2)+1/2)/6 }
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