7x + 4 + 2x + 9, 9x + 12, 9x + 13, 12m - 5 - 3m + 8, 8m - 3, 9m + 3, 6y + 3x - 2y + 8x, 4y + 11x, 4x + 11y, 5a + 2b - a + 7b - 3a, a + 9b, 9a + 9b, 4xy + 3xy - 2x + 5x, 7x7y + 3x, 7xy + 3x

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