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m - (1+(m-1)/f) - ((2+(m-1)/f)*((((f-1)/f)-((f-1)/f)^n)/(1-((f-1)/f)))) - (((n-1)*((f-1)/f))/(1-((f-1)/f))) + ((((f-1)/f)-((f-1)/f)^n)/(1-((f-1)/f))^2)= 0
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