I seem to be missing something with the rules of exponents. Maybe someone can help. How does (3e)e^-1/x get to 3e^(x-1)/x? If I apply the rule for adding exponents when multiplying by the same base, i.e, e^1 x e^-1/x, I get e^1+(-1/x), but from here I can't seem to get to e^(1-x)/x. I hope this adequately communicates my problem. Any help will be appreciated.