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2. 9y^2 - 4xy + 5y + 7y^2 + 3xy
9y^2 + 7y^2 - 4xy + 3xy + 5y
16y^2 + xy + 5y . (b)
3. b
4. 6x - 5y -2z - 8x + 6y + 9z
-2x +y + 7z