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So you can't divide by a negative number, according to your rules...

Wouldn't it always be possible to interpret it as a negative sign?

4-n = 4+(-n)

x*(y+z)
x*-y works fine.
(a+b)*(c+d)

He did at the end of his last post.

Whoops. Nevermind. Forgot about the whole 'space after a minus sign' thing.

It has the wrong output for (x-y)^2