Factorise :
2b(2a + b) - 3c(2a + b)
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= (2a + b)(2b - 3c)
Hence,2b(2a + b) - 3c(2a + b) = (2a + b)(2b - 3c)
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x2(a - b) - y2(a - b) + z2(a - b)
(x + y)(a + b) + (x - y)(a + b)
12abc - 6a2b2c2 + 3a3b3c3
4x(3x - 2y) - 2y(3x - 2y)