Symbols for latex Suite

Hi I’m trying to reproduce this equation
and I’m having a problem with the top lines.
Are this lines possible?

Try something like:

\overline{a + b} = \bar{a}.\bar{b}

Which in my case renders as:

And I found this through re-reading this reference sheet:

Another reference which is a little more visual, and not as dense as the first one:

Thank you, it works perfectly.