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(11x^4 + 37x^3 + 19x^2 - 55x - 12)/(36x(x+3)(x+4)) / (x/(x+1) + x/(x-1))
(11x^4 + 37x^3 + 19x^2 - 55x - 12)/(36x(x+3)(x+4)) / (x/(x+1) + x/(x-1))
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