Finding the Integrating Factor

Question: For what values of and will be an integrating factor for the differential equation

The exact differential equation which results from multiplying by this integrating factor has solution where ___________________________.

Attempt at solving the question:

First I check to see whether either differential is exact (equal to each other), of course they are not.

The continue to solve and reach this point:

I should be able to factor something out, but i don't seem to find any, so am I doing the question wrong?