Facrorise $m (m - 1) - n (n - 1)$

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Solution

$m (m - 1) - n (n - 1)$
$m^{2} - m - n^{2} + n$
$(m^{2} - n^{2}) - (m - n)$
$(m + n) (m - n) - (m - n)$
$= (m - n) (m + n - 1)$

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