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= -20x + 13y
2. (3p + 9q) - 2p (8q + 7) =
= 3p + 9q - 16pq - 7
3. -3ab (a + 2b - 5) + 4b (6a + 3b + 1) =
= -3a²b - 6ab² + 15ab + 24ab + 12b² + 4b =
= -3a²b - 6ab² + 39ab + 12b² + 4b =