factorised a (a+3) - a - 3
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a(a+3) - a-3 = a2 + 3a - a - 3
= a2 +2a - 3
= a2 + 3a - a - 3
= a( a+ 3) - 1 (a+3)
=(a+3) ( a-3)
= a= - 3 or a =3
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