I don't know if we've been taught the general method for De Morgan's, but I'll say it anyway:
- NOT the whole sentence
- NOT each item in the brackets (direct children only)
- INVERT each AND/OR. This makes AND become OR, and vice-versa (direct children only)
When I say direct children only, I mean that if you have (A or (B and C))
, you should end up with not (not A and not (B and C))
by De Morgan's.
You should NOT end up with not (not A and (not B or not C))
.