Doesn’t matter. As long as x \neq 1, 0, LHS is always -1.

The median would be the mean of the 12th and 13th integer. One of them is less than 50, while the other is greater than 50. What can you conclude about the median?

We have a < 1 and b > 1

This means that \frac{1}{a} > 1 and \frac{1}{b} < 1 (trying some examples may help).