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Question: Collect function with respect to expression

Question:Collect function with respect to expression

ControlLaw 40 Maple
April 24 2023
1

Hello,
I wonder why in the collect function:  collect(exp, abs (x-x0)) work and collect(exp, x-x0) doesn't? 
I would like to use both, any tip how to change the x-x0 to be seen like abs (x-x0), Or maybe another solution better than the collect function

Merci 

Best regards 
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