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hope this will help you Mark as brainliest
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Questions 9
a. -2ab+12a+2b .
b. 5pqr-7pq-2pr-3qr.
Step-by-step explanation:
a. 20a-9ab+5b-20 -(8a-7ab+3b-20)
20a-9ab+5b-20-8a+7ab-3b+20
20a-8a-9ab+7ab+5b-3b-20+20
12a-2ab+2b
-2ab+12a+2b. ANS
b. -4pq+2qr-2pr+5pqr+1 - (3pq+5qr-7pr+1)
-4pq+2qr-2pr+5pqr+1 -3pq-5qr+7pr -1
-4pq-3pq+2qr-5qr-2pr+5pqr+1-1
-7pq-3qr-2pr+5pqr
5pqr-7pq-2pr-3qr. ANS
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