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((3*26)/(1+0.1x+0.7x^2))/(1+(26)/(1+0.7x)*3/(1+0.1x+0.7x^2)
((3*26)/(1+0.1x+0.7x^2))/(1+(26)/(1+0.7x)*3/(1+0.1x+0.7x^2)
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