10a - 8a + 5a – 3a , 2y - 7y – y – 4y, 10x - 20x + 30x – 40x , 8t - 2t + 7t – t, 6r - 13r – 6r – r , 20a - 2 - 8a + 12a – 2, 9m + 8 - 8 + 6m + 3m , 4n + 5 - 7 + n – 2 + 3n, 10k + 8 - 12k – 2k + 8 , 4x + 6 - 5x + 8 – x – 2, 6y + 9 - 12 + 4y – 3 + 2y , 10e + 2 - 14e – e – 3e + 2, 3r + t - 5r – 2r + t , 6x + 12y - 8x + 12y – 2x, 11j + 8k + 5 - 8j + 6k + 3j + 2k + 5 , 2n + 3t + 4 - 6 + 2n – 2 + 3t, 4d + 3r -4 - 5r – 2r + 8d – 4 – 4d , 5x + 6y + 9 - 2x + 8y + 3x – 2y + 5 + 4, 6t - 3m + 9 - 12 + 4t – 3m + 2t – 3,

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