Answer:
x < 2
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDAS 
- Brackets 
- Parenthesis 
- Exponents 
- Multiplication 
- Division 
- Addition 
- Subtraction 
Equality Properties 
- Multiplication Property of Equality 
- Division Property of Equality 
- Addition Property of Equality 
- Subtraction Property of Equality 
Explanation:
Step 1: Define
Identify
x - 13 < -11
Step 2: Solve for x
- [Addition Property of Equality] Add 13 to both sides: x < 2
Here we see that any value x smaller than 2 would work as a solution.