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x+1 x-1
3(x-1) + 3(x+1) =
(x+1)(x-1) (x-1) (x+1)
3x-3+3x+3 =
(x+1)(x-1)
3x+3x-3+3 =
(x+1) (x-1)
6x
(x+1) (x-1)