Algebra
posted by Anne .
(a^2  4a)/(a^2a6) minus (a6)/a^2a6)

Algebra 
Steve
combine terms to get
(a^2  4a  a + 6)/(a^2a6)
= (a^25a+6)/(a^2a6)
= (a3)(a2)/((a3)(a+2))
= (a2)/(a+2)
if a≠3
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