yes the answer above is correct but to explain it 
3.5×+10 <-30 subtract 10 from both sides so this moves the 10 to the other side to get 
3.5x<-30-10 then 3.5×<-40 
then you want to move the 3.5 by dividing it to both sides so you just have the x to get x < -40÷3.5 then x <-11.43 
I know this correct.