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There are common words in the English language that, used in a sentence, can be spoken correctly but not be written correctly.

Well it's been a week, so: Answer to post 1: x+y = abcde where a=x-y, bc=x*y, and de=x+y. Answer to post 3: (Well, obviously I can't write it correctly, but here's as close as I can getPlease Register or Log in to view the hidden image! "There are three ways to spell the word to."

It is sort of funny, I did quite well in math classes up through differential equations, but I am horrible at 'brain teasers'. For instance I have no idea how that answer and the question are related in any way.

You mean wegs's's'? It looks a lot worse than it is. 7+3=42110 The '4' is 7-3, The '21' is 7x3, The '10' is 7+3.