Find the difference between two sets, namely ${-8, 3, 4} \setminus {7, -2.1, -8, 3, -\frac{66}{7}, -\frac{9}{2}, -6}$.

fst = set((-8, 3, 4,))
snd = set((7, -2.1, -8, 3, -(66/7), -(9/2), -6,))
print(fst - snd)
