`a) x<800/-50`
⇒`x<-16`
⇒`x∈{-17,-18,-19,...}` vì `x∈Z`
`b) x<(-533)/41`
⇒`x<-13`
⇒`x∈{-14,-15,-16,...}` vì `x∈Z`
`c) x<(-513)/-19`
⇒`x<27`
⇒`x∈{26,25,24,...1,0,-1,-2,-3,....}` vì `x∈Z`
` d) x<0/18`
⇒`x<0`
⇒ `x∈{-1,-2,-3,.....}` vì `x∈Z`
`e) x<-14/5`
⇒`x<-2,8`
⇒ `x∈{-3,-4,-5,-6,.....}` vì `x∈Z`