There, okay I can rewrite the 12^(4x) as [3 x 4]^(4x), if you don't believe me
just practice this yourself, forget the x and just practice with 12^4 = (4^4)x(3^4)
or better yet, get a calculator and see if 12^4 - [(4^4)x(3^4)] = 0, I bet it does ;)
and I would keep going except that I have to go, I'm sure you've got the idea anyway. You want it as simplified as possible.
Btw: these get really easy & I went way overboard here, these questions take about 10 seconds to do when you get the hang of them. You want them as factored as possible, there's more that can be done & all of this could of been done quicker but I wanted to show you what you could have done & to give you ideas.