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(5a/(a+x) +5x/(a-x) + (10ax)/(a^2-x^2))*(a/(a+x) +x/(a-x) - (2ax)/(a^2-x^2))
(5a/(a+x) +5x/(a-x) + (10ax)/(a^2-x^2))*(a/(a+x) +x/(a-x) - (2ax)/(a^2-x^2))
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