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= (x+1) (x-2) / (x+2) (x-2) + (1-x) (x+2) / (x+2) (x-2)
= (x^2 - x - 2)+(-x^2 + 3x - 2) / (x^2 - 4)
= (2x - 4) / (x^2 - 4)
= 2 (x - 2) / (x+2) (x-2)
= 2 / (x - 2)