x*(x + 3) - 6 > 3*(x + 1)
Or(And(-oo < x, x < -3), And(3 < x, x < oo))
((-oo < x)∧(x < -3))∨((3 < x)∧(x < oo))
(-oo, -3) U (3, oo)
x in Union(Interval.open(-oo, -3), Interval.open(3, oo))