And just to be clear what I did here, you literally could put the natural log here, natural log there, and you could put the natural log there as well to see that step. This is saying what power do I have to raise e to to get e to the negative four x? Well, obviously I just need to raise e to the negative four x over there. So this power is negative four x. And then we just took the natural log of the right-hand side as well. And then to solve for x, we can divide both sides by negative four. So you get x is equal to, or we could multiply both sides by negative one-fourth either way.