6 + 5a + 4 + a - 6a + 10, r + 3r + 4r - 8r, 9 + 2n + n - 3 - 3n + 6, 5w + 5w + 5 - 10w + 5, 3x - 2x + 4 - x + 4 , 12 + 9 + 9n + n + 2n - 12n + 21,

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