Ответ:
4)5x-20-7x-7<-2x-6
5x-7x+2x<-6+20+7
x<21
5)x2+3x+1>3x
x2>1
>1
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Ответ:
4)5x-20-7x-7<-2x-6
5x-7x+2x<-6+20+7
x<21
5)x2+3x+1>3x
x2>1
>1