Question is in the link. I was thinking that the way to get rid of the e is to take the ln of both sides, but can you even take then ln of 0?

Help is much appreciated!

http://img42.imageshack.us/img42/4577/22729885.jpg (just zoom it in, and my cursor is beside the x, its supposed to be (b) x =500 units).

Thanks,

Auger