Mower is mowing uneven. Left blade is cutting about half an inch to three fourths of an inch lower than the right side on a lt1000 craftman mower.

How does one adjust the blace height or the mower deck to make both sides cut at the same height?

I would suspect a couple of different things here.
Broken spindle assembly bolts; or bent blade.
I would think the bent blade would be your problem.