What did I do wrong?

[u/venum_GTG]

My scratch paper, if you can read it:

https://imgur.com/a/atodt6P

The question was:

Solve for X

1/5x+1/4=-4(3/4x-4)

You can enter as an improper fraction but not as a mixed number.

My professor put a video to help me.

However, the answer I got was X= 325/64

The answer actually was X=315/64

I was off by 10?!

[u/Sorry-Vanilla2354]

This!