Solve each equation or inequality

Can anyone offer assistance for the following two problems

1. 5^x=4^x+3 This is what I did

log 5^x=log 4^x+3

x log 5=x+3 log 4 Now I am stuck (Crying)

2. .16^4x+3= .3^8-x

I am not entirely sure on how to start this one(Giggle)