Factorise: a(a-3) - b(b-3)
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a(a-3) - b(b-3)
a^2 - 3a - b ^2 +3b
a^2 - b^2 -3a + 3b
(a+b)(a-b) -3a + 3b
a^2 - 3a - b ^2 +3b
a^2 - b^2 -3a + 3b
(a+b)(a-b) -3a + 3b
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