Question: Negation of numerator and denominator

I often find maple returning fractions of the following form: - (1/ (x-1)) This would look a whole lot nicer if maple could simplify it to the equivalent: 1/(1-x) I've tried various forms of simplify, breaking up the numerator and denominator then recombining them, etc., but I can't find a general way to do this. Is it possible to customize "simplify"'s notion of complexity?
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