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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x+(2/2)*x-1 = x-(12/x)+6 // - x-(12/x)+6
3*x+(2/2)*x-x+12/x-6-1 = 0
3*x^1+12*x^-1-7*x^0 = 0
(3*x^2-7*x^1+12*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2-7*x^1+12*x^0) = 0
x^1
3*x^2-7*x+12 = 0
3*x^2-7*x+12 = 0
DELTA = (-7)^2-(3*4*12)
DELTA = -95
DELTA < 0
x in { }
x belongs to the empty set
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