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= 7a - 9a + 8 - 5
= -2a + 3
2.(2x + 3xy - 2y) - (9x - 3xy - 3y) = 2x + 3xy - 2y - 9x + 3xy + 3y
= 2x - 9x + 3xy + 3xy - 2y + 3y
= -7x + 6xy + y