a)x-1/x^2+x + x+1/x^2-x b)6x-1/4x^2-1 + 3-2x/2x^2-x - 1/2x+1 c)x+1/x^2-25-x+1/x^2-5x+x-1/x^2+5x d)2x-4/x^2-2x+1-x+2/x+x+1/x-1
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