4 - x 1 ----- > ----- x - 5 1 - x
(4 - x)/(x - 5) > 1/(1 - x)
Or(And(1 < x, x < 3), And(3 < x, x < 5))
((1 < x)∧(x < 3))∨((3 < x)∧(x < 5))
(1, 3) U (3, 5)
x in Union(Interval.open(1, 3), Interval.open(3, 5))