7x + 4 + 2x - 1, 9x + 3, 10a - 3b - 4a + 8b, 6a + 5b, 5y + 6 + 2y - 4, 7y + 2, 9m2 + 5m - 3m2 + 2m, 6m2 + 7m, 12 - 4k + 3 - 2k, 15 - 6k, 8 + 12 / 3 x 2, 16, 5 ( 2+4 ) - 7, 23, 20 - 32 + 4 x 2, 19, 15 / 3 x 4 x 2, 26, 9 + 5 x 3 - 3, 21.

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