Factorise :
(x + y)(a + b) + (x - y)(a + b)
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3x5y - 27x4y2 + 12x3y3
x2(a - b) - y2(a - b) + z2(a - b)
2b(2a + b) - 3c(2a + b)
12abc - 6a2b2c2 + 3a3b3c3