So first let’s multiply both sides by 10
Now we are left with this:
-4x-90<9
Now you want to move the -90 to the other side and when you do this you have to change the sign as well so now you have this:
-4x<9+90
Now add 9 and 90 together and you’ll get this:
-4x<99
Then divide both sides by -4 and flip the inequality sign
x>- 99/4
Your answer would be:
x>- 99/4
Hope this helps! :3