4-7X-21<-9 -7X<-9+21-4 -7X<8 X< 8/-7 Хэ (-∞; -8/7)<br>5Х+2<4X+8 X<6 Xэ(-∞;6)<br>8х+3<4x-1 4x<-4 x<-1 Xэ(-∞;-1)<br>9x+7<8x-3 x<-10 Xэ(-∞;-10)<br>5x-2>0 5x>2 x>0.4 Хэ(0,4;+∞)
3х+18>0 3x>-18 x>-6 Xэ(-6; +∞)
8х+6>0 8x>-6 x>-0.75 Xэ(-6/8;+∞)
5x-3>6 5x>9 x>1.8 Xэ(1.8; +∞)
20x-11>0 20x>11 x>0.55 Xэ(0,55; +∞)
2x-3<16 2x<19 x<9.5 Xэ(-∞;9.5)<br>-4x-6<7 -4х<13 x<3.25 Xэ(-∞<strong>;3.25)
4х+5>2 4x>-3 x>-0.75 Xэ(0.75;+∞) (не за что)