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minimize 3*a+3.6*b+4*c given (87a+89b+93c)/(a+b+c)=91, a>=0, b>=0, c>=0,a+b+c=20
minimize 3*a+3.6*b+4*c given (87a+89b+93c)/(a+b+c)=91, a>=0, b>=0, c>=0,a+b+c=20
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