Factorise :
12abc - 6a2b2c2 + 3a3b3c3
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= 3 x 4abc - 3 x 2a2b2c2 + 3a3b3c3
= 3abc(4 - 2abc + a2b2c2)
Hence,12abc - 6a2b2c2 + 3a3b3c3 = 3abc(4 - 2abc + a2b2c2)
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(x + y)(a + b) + (x - y)(a + b)
2b(2a + b) - 3c(2a + b)
4x(3x - 2y) - 2y(3x - 2y)
(a + 2b) (3a + b) - (a + b)(a + 2b) + (a + 2b)2