x2-(2a+1/2a)x+1 factorise
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(x^2 +( a^2 --1) /a ) x--1
a^2 /a --1/a = (a --1/a)
x^2 + ( a--1/a) x- -1
x^2 +ax -- x/a --1
a x (x+ a) -- a ( x/a +1)
(ax -a ) ( x+a)
a (x-a) (x+a)
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