Answer:
Refer to the attachment
6a²+7ab-7a+17b-20b²-3
Explanation:
3a(2a+5b-3)-4b(2a+5b-3)+1(2a+5b-3)
6a²+15ab-9a-8ab-20b²+12b+2a+5b-3
Collect like terms
6a²+15ab-8ab-9a+2a+12b+5b-20b²-3
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