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Let x,y,zx, y, zx,y,z be real numbers satisfying x+y+z=15x+y+z=15x+y+z=15 and xy+yz+zx=72xy+yz+zx=72xy+yz+zx=72. Let the minimum value of xxx be S,S,S, and the maximum value MMM.
Find the value of S+M.S+M.S+M.
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