Factorise :
(a + 2b) (3a + b) - (a + b)(a + 2b) + (a + 2b)2
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12abc - 6a2b2c2 + 3a3b3c3
4x(3x - 2y) - 2y(3x - 2y)
6xy(a2 + b2) + 8yz(a2 + b2) - 10xz(a2 + b2)
xy - ay - ax + a2 + bx - ab