Heya!

I've been struggling with this for some time now and would really appreciate some help. Need to show that the right side equals the left side.

Tried different ways to solve this but I get stuck each time.

RS = Rightside; sorry if this is not the right way to type this. Not familiar with the english terms

RS:

After this I've experimented with changing 1's to among many other things.

Honestly feels like I am really on the wrong track here. Mostly the that annoys me.

Can someone shed some light on this for me? Thanks in advance!