plot [-(15*r^3/x -15*r^2)+(x^2/2-r^2/2)=0.5] for r=0 to 0.5 and x=0 to 1plot [-(15*r^3/x -15*r^2)+(x^2/2-r^2/2)=0.5] for r=0 to 0.5 and x=0 to 1

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