Factorise the following by regrouping. (a) 9mz - 4nc +3mc - 12nz (b) 4xy + 6 -X- 24y (c) 12xy - 28x - 15y + 35 (d) 6x2 + 3xy - 2ax - ay (e) 40ac2 + 25ak? + 32bc2 + 20bk2
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I don't know
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