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1 / x + 1-x + 3 / x ^ 2-1 divided by x ^ 2 + 4x + 3 / x ^ 2-2x + 1, where x = - 1 / 2
=[(x-1)-(x+3)]/(x+1)(x-1) ×(x-1)^2/(x+3)(x+1)
=-4(x-1)/(x+1)^2(x+3)
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