factorise a7 - ab6 fast caus my exam is tommorow
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a7 - ab6 = a(a6-b6)
-> a(a2-b2)(a2+b2+ab)
->a(a-b)(a+b)(a2+b2+ab)
-> a(a2-b2)(a2+b2+ab)
->a(a-b)(a+b)(a2+b2+ab)
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