5<a<9
25<5a<45
2<b<7
-7<-b<-2
-7/3<-b/3<-2/3
----------
неравенство верно при любом значении a и b
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5<a<9
25<5a<45
2<b<7
-7<-b<-2
-7/3<-b/3<-2/3
----------
неравенство верно при любом значении a и b