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16(x+y+z)(yz/(2z+x+y)+zx/(2x+y+z)+xy/(2y+x+z))^2-27xyz,x=a,y=a+u,z=a+v
16(x+y+z)(yz/(2z+x+y)+zx/(2x+y+z)+xy/(2y+x+z))^2-27xyz,x=a,y=a+u,z=a+v
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