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I wrote double inequalities like the following, but getting error msg. How can I write it?

Plz help

ratio (s).. 0.2=l=(sum (d, x(d,s)))/(sum(d,(x(d,s)+y(d,s))))=l=0.3;
range(s).. 300=l=sum (d, x(d,s)+y(d,s))=l=500;