Final answer:
The important steps when simplifying polynomials include combining like terms, using the distributive property, removing parentheses, simplifying fractions, and checking for further simplification.
Step-by-step explanation:
- Combine like terms by adding or subtracting them.
 - Use the distributive property to simplify expressions.
 - Remove parentheses by applying the distributive property.
 - If there are any fractions, simplify them by finding a common denominator and adding or subtracting them.
 - Check if there are any like terms that can be combined further.
 
Example:
Simplify the polynomial expression: 3x^2 + 4y + 2x^2 - 3y + 5x - 2.
Solution:
- Combine like terms: (3x^2 + 2x^2) + (4y - 3y) + 5x - 2.
 - Simplify each set of parentheses: 5x^2 + x - 2.
 
Answer: The simplified polynomial expression is 5x^2 + x - 2.