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system (x^2+y^2)=9, (z-x)^2+y^2=16, (z/2-x)^2+(sqrt(3)/2 z-y)^2=25
system (x^2+y^2)=9, (z-x)^2+y^2=16, (z/2-x)^2+(sqrt(3)/2 z-y)^2=25
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