(x-x²/x+1)÷(1-x²-1)

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(x-x²/x+1)÷(1-x²-1)(x-x²/x+1)÷(1-x²-1)(x-x²/x+1)÷(1-x²-1)(x-1)/(x+1)

(x-x²/x+1)÷(1-x²-1)
(x-x²/x+1)÷(1-x²-1)

(x-x²/x+1)÷(1-x²-1)
(x-1)/(x+1)