Hi!
First off, I noticed you're using Khan. I just wanted to say I love Khan :D
Okay so let's solve the inequality.
Whatever we do to the inequality, we have to do it to both sides.
4x - 1 + 1 < 11 + 1
4x < 12
Divide by 4 on both sides
4x/4 < 12/4
x < 3
^ the answer
Hope this helps! :)