With the fear of incurring your wrath I agree with Farkel's first post about "not being able to prove 2+z-1+10=13". As you can prove z in that equation it renders it useless in trying to use that specific equation in the illustration imho. However the general mathmatical equation you used u+v+w+x+y+z=1914 to illustrate the absurdity of reaching 1914 I wholeheartedly agree with.
You said, "are you content with making your point by attacking the form of my argument instead of its substance?" Obviously this wasnt to me but theres no need to be so defensive. Even though I disagree with a small part of your post I still think you make a very good point. Its all good.