ContourPlot[( sqrt(x/3) (2.68652 10^-14 sqrt(1.32235 10^27 x y 2.96509 10^26)-0.462604) (0.512356-2.97545 10^-14 sqrt(1.32235 10^27 x y 2.96509 10^26)) 1.14249 x y)/(x y)=1,{x,0,7},{y,4,15}]

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