Boolean algebra simplification ?

[KaliBanda]

Homework Statement

Homework Equations

DeMorgan’s Theorems.

The Attempt at a Solution

I've had a go at it, not sure if I'm heading in the right direction though.

Thanks for any help.

 

[mfb]

Where does the second + in line 4 come from? I would expect * there, as you had it in line 3.
Anyway, I would use another direction there:
$(\overline{AC})\overline{C}$ has a nice simplification.