Ответы на вопрос:
(x/(x-1)-1) * xy-y/x = (x/(x-1) - (x-1)/(x-1) * xy - y/x = (x - x + 1)/(x-1) * xy - y/x = 1/(x-1) * xy - y/x = xy/(x-1) - y(x) = xy*x/(x-1) - y*(x-1)/x = (x^2y - xy + y) / (x-1)
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