b, x+4/2x+4 + x-2/x^2-4 c, x^2/x+1 + 2x/x^2-1 + 1/1-x + 1

b, x+4/2x+4 + x-2/x^2-4 c, x^2/x+1 + 2x/x^2-1 + 1/1-x + 1
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