This is where the logic breaks down to the pointless:
(2-2)(2+2) = 5(2-2)
So 0*0 = 5*0, or 0 = 0
0 = 0 doesn't prove anything other than the value of zero.
Hubby gets home, uses a tow strap - yanks it out first-try, and asks what's for dinner.
But there is no dinner, because she spent all day destroying every single one of his tie-down straps.
I think I would have broken it down for them on paper.
"Let me get this straight:
If I get a bacon cheeseburger it's $12 + $2.50 for bacon - so a bacon cheeseburger is $14.50
If I get a cheeseburger and add bacon, it's $10 + $2.50 for bacon - so a cheeseburger with bacon is