Posted by Anne on Monday, August 13, 2012 at 11:02am.
combine terms to get
(a^2 - 4a - a + 6)/(a^2-a-6)
= (a^2-5a+6)/(a^2-a-6)
= (a-3)(a-2)/((a-3)(a+2))
= (a-2)/(a+2)
if a≠3
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