Algebra-1

Question Analysis
This question tests the ability to simplify a polynomial and then determine its degree, combining both algebraic manipulation and degree calculation.

Key Concept Explanation
To find the degree of a polynomial, it must first be simplified by combining like terms. The degree is then determined by the highest degree among the simplified terms.

Step-by-step Solution
1. Distribute and combine like terms:
Distribute:
Combine:
Simplify:
2. Identify each term and calculate its degree:
Term

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