Question: Order of operands

When I enter x-y Maple echoes x-y. When I enter y-x Maple echoes y-x. When I enter b - a Maple echoes  b-a.  But when I enter a-b Maple echoes -b + a

I fiind this promotion of negatives, which also occurs in more complicated expression, somewhat confusing.

Is there any description of the rules Maple uses and perhaps ways of controlling them?

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