Factorise the following:
5a4 - 5a3 + 30a2 - 30a
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5a4 - 5a3 + 30a2 - 30a = 5a(a3 - a2 + 6a - 6)
= 5a[a2(a - 1) + 6(a - 1)]
= 5a(a - 1)(a2 + 6).
Hence, 5a4 - 5a3 + 30a2 - 30a = 5a(a - 1)(a2 + 6).
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