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x in (-oo:+oo)
x*((3*x-3+6)/6)+6 = 0
(x*(3*x+3))/6+6 = 0
(x*(3*x+3))/6+(6^2)/6 = 0
x*(3*x+3)+36 = 0
3*x^2+3*x+36 = 0
3*x^2+3*x+36 = 0
3*(x^2+x+12) = 0
x^2+x+12 = 0
DELTA = 1^2-(1*4*12)
DELTA = -47
DELTA < 0
3 = 0
3/6 = 0
3/6 = 0 // * 6
3 = 0
x belongs to the empty set
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