Factorise:xy-pq+qy-px
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xy-pq+qy-px
xy-px-pq+qy
x(y-p)+q(-p+y)
x(y-p)+q(y-p)
(y-p)(x+q)
xy-px-pq+qy
x(y-p)+q(-p+y)
x(y-p)+q(y-p)
(y-p)(x+q)
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