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Maple cancelling fractions problem

Hi all

I'm having trouble with Maple and cancelling fractions properly. I will demonstrate. As you can see the method using sub and fractions doesn't work whilst directly copying it into a stacked fraction does. I can see that it must be to do with which fraction is the main one (largest bar) but if I put in my variables like they appear it changes and thus doesn't cancel properly.

I have also include the maple file with the actual problem in context if that helps.

Any help would be much appreciated.

Thanks, Yogi