x -- - 15 < 0 2 x
x/x^2 - 15 < 0
Or(1/15 < x, x < 0)
(1/15 < x)∨(x < 0)
(-oo, 0) U (1/15, oo)
x in Union(Interval.open(-oo, 0), Interval.open(1/15, oo))