2a x 3b, 6ab, 2a + 3b, 2a + 3b, 2b + 3 - 4b + 1, - 2b + 4, 6 - 2y + 7 - 4y - 5, - 6y + 8, 4a + 2y - a - 3y - 3a, -y.

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