From this statement I'm guessing you want to know how to convert this into an algebraic equation.
To do so. It is important to remember the inequality signs. <, > etc.
-30x > -400
-30x/-30 < -400/-30
X < 400/30
X < 40/3
X < 13.3333.
The solution are any values of X less than 13.3333. This will make the above equation true.