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-k*sqrt(1-((93-32*sqrt(3))*sqrt((257049*(-(16*(93-32*sqrt(3))^2*k^4)/28561+16*k^4+64*sqrt(3)*k^2-152*k^2-304*sqrt(3)+553)*(x-k)^2)/(16*(93-32*sqrt(3))^2*k^6)+1))/169)=1/((93-32*sqrt(3))/169-1)-2
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