(x + 4)*(x - 12) > 0
(x - 12)*(x + 4) > 0
Or(And(-oo < x, x < -4), And(12 < x, x < oo))
((-oo < x)∧(x < -4))∨((12 < x)∧(x < oo))
(-oo, -4) U (12, oo)
x in Union(Interval.open(-oo, -4), Interval.open(12, oo))