m²n(x-y)²-mn(y-x)

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m²n(x-y)²-mn(y-x)
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m²n(x-y)²-mn(y-x)
m²n(x-y)²-mn(y-x)

m²n(x-y)²-mn(y-x)
m²n(x-y)²-mn(y-x)
=m²n(x-y)²+mn(x-y)
=mn(x-y)(m+x-y)

mn(y-x)(mx-my-1)