Factorise the following:
2a - 4b - xa + 2bx
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= 2(a - 2b) - x(a - 2b)
= (2 - x)(a - 2b).
Hence, 2a - 4b - xa + 2bx = (2 - x)(a - 2b).
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y2 - xy(1 - x) - x3
ab2 + (a - 1)b - 1
5ph - 10qk + 2rph - 4qrk
x2 - x(a + 2b) + 2ab