Bonjour,
-5n<20=> n > 20 /-5 => n > −20/5; n > -4
5n<20 => n < 20/5=> n < 4
5n<-20 => n < -4
-5n<-20 => n > -20 /-5 => n > 20/5 => n > 4
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Bonjour,
-5n<20=> n > 20 /-5 => n > −20/5; n > -4
5n<20 => n < 20/5=> n < 4
5n<-20 => n < -4
-5n<-20 => n > -20 /-5 => n > 20/5 => n > 4