Answer the question and fill in the right letters to the corresponding answer in the box and forma single word.
1. (1+2) (y13)
2. (n=4)(n-1)
3. (x-2)(x+7)
4. (a 3b) (a+2b)
5. (x-4) (x-8)
6. (m5) (m-6)
7. (a-3) (a 9)
8. (3r-1) (4r+20)
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