Question 125726
(5fc)/(f^2-c^2) - (f-c)/(f+c)

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The lcm is f^2-c^2
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(5fc)/lcm - (f-c)^2/lcm

= [5fc-(f^2-2fc+c^2)]/lcm

= (c^2+7fc-f^2)/(f^2-c^2)
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Cheers,
Stan H.