1. Factorise 6a + 72
2. Factorise 9 + 54c
3. Factorise 12b + 28
4. Factorise 27 + 63y
5. Factorise 14a + 28ab
6. Factorise 2a + 4ab + 8ac
7. Factorise 28 + 32a − 40ab
8. Factorise 27a − 36ab − 63abc
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