Factorise the following:
6xy2 - 3xy - 10y + 5
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= 3xy(2y - 1) - 5(2y - 1)
= (2y - 1)(3xy - 5).
Hence, 6xy2 - 3xy - 10y + 5 = (2y - 1)(3xy - 5).
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a2b - ab2 + 3a - 3b
x3 - 3x2 + x - 3
3ax - 6ay - 8by + 4bx
5px - 8qy + 4qx - 10py