Problem:

25-x^2 6
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12 5-x
What I Got:
5-x
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2
*Please Check My Work And Tell Me If I am Correct or wrong.If I am wrong please help me as much as possible.Thank you~

Wrong. When are you going to factor the 25-x^2 ?

The 5-x then will divide out.

oh...so then will it be:
(5+x)
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2