2 x + x - 45 ----------- <= 3*x + 1/2 x - 6
(x^2 + x - 45)/(x - 6) <= 3*x + 1/2
Or(And(4 <= x, x <= 21/4), And(6 < x, x < oo))
((4 <= x)∧(x <= 21/4))∨((6 < x)∧(x < oo))
[4, 21/4] U (6, oo)
x in Union(Interval(4, 21/4), Interval.open(6, oo))