A)2x+3<9<br>2x+3<-9<br>2x<6<br>2x<-12<br>-6>x<3<br>
б)5х+2>=4,4
5х+2<=-4,4<br>5x>=2.4
5x<=-6.4<br>x>=0.48
x<=-1.28<br>0.48>x<=-1.28<br>
в)3х-7>5
3х-7<-5<br>3х>12
3х<2<br>x>4
x<0.66<br>0.664
г)2х-9<=3,5<br>2х-9>=-3,5
2x<=12.5<br>2x>=5.5
x<=6.25<br>x>=2.75
6.25==2.75