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(-35+(143 x)/6-5 x^2+(4 x^3)/9)/(2 sqrt(x^2+(7-(5 x)/2+x^2/3)^2)) = 0
(-35+(143 x)/6-5 x^2+(4 x^3)/9)/(2 sqrt(x^2+(7-(5 x)/2+x^2/3)^2)) = 0
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