Can these expressions be simplified?

Yes but not any very much more useful.

a =(-c+cd)/2
a = (-c(1-d))/2
a =-.5c(1-d)

b = -cd/2
b = -.5cd

You may want to double check my math, but I am 99% sure I am right.

Really!? That looks so strange. Here are the real life expressions - the way they looked in my head.

bevelPlus1.extrudeDepth=-(transform2.flangeWidth/2)-((transform2.bevelWidth)/(1/-(transform2.flangeWidth/2)));
bevelPlus1.depth=((transform2.bevelWidth)/(1/-(transform2.flangeWidth/2)));

I was able to pull the 2 out by trial and error. It made them look like this:

bevelPlus1.extrudeDepth=-(transform2.flangeWidth-transform2.bevelWidth/(1/transform2.flangeWidth))/2;
bevelPlus1.depth=-transform2.bevelWidth/(1/transform2.flangeWidth)/2;

But that's when it stopped making sense.

Thank you very much Redcap, that's going to save me a lot of work.

Btw, is there anything inherently faster about .5c than c/2?

Just an fyi Redcap, your simplified expressions worked perfectly. That's sixteen! utility nodes I will not have to connect up. Thanks again.