Factorise the following:
x2 + xy - x - y
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= x(x + y) - 1(x + y)
= (x + y)(x - 1).
Hence, x2 + xy - x - y = (x - 1)(x + y).
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10a(2p + q)3 - 15b(2p + q)2 + 35(2p + q)
x(x2 + y2 - z2) + y(-x2 - y2 + z2) - z(x2 + y2 - z2).
y2 - yz - 5y + 5z
5xy + 7y - 5y2 - 7x