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A $1281_w63_h21.png$
When subtracting polynomials the first step is to distribute the negative sign through the parentheses. This changes the sign on each term inside the parentheses:
Arrange like terms next to each other (optional):
Combine like terms to compute the answer: $1281_w63_h21.png$.
B $6284_w123_h21.png$
C $4615_w63_h21.png$
D $6439_w123_h21.png$