Combine: 3x + 4x, 7x, 7, 12x, x, Combine: 5y - 2y, 3, 7y, -3y, 3y, Combine: 6a + a, a, 7a, 6a, 7, Combine: 9m - 4m, 13m, 5, 5m, -5m, Combine: 2b + 3 + 5b, 7b + 3, 7b, 10b, 8b + 3, Combine: 4n + 7 - 2n, 2n, 6n + 7, 9n, 2n + 7, Combine: 8p - 3 + 2p, 5p, 10p + 3, 10p - 3, 6p - 3, Combine: 7c - c + 4, 8c + 4, 6c + 4, 6c, 4c + 4, Combine: 3x + 2y + 4x, 7x + 2y, 7x + 2, 9xy, 5x + 2y, Combine: 6r + 5 - r + 2, 5r + 3, 6r + 7, 7r + 7, 5r + 7, Combine: 12x - 5x + 3x, 10, 4x, 10x, 20x, Combine: 7y + 9 - 2y - 4, 9y + 5, 5y + 5, 5, 5y + 13, Combine: 4a + 3b + 2a - b, 6a + 4b, 2a + 2b, 6ab, 6a + 2b, Combine: 10m - 6 + 2m + 8, 12m + 14, 12m + 2, 12m - 2, 8m + 2, Combine: 5x + 2 - 3x + 7, 2x + 9, 8x + 9, 2x - 9, 2x + 5, Combine: 9p - 4q + 2p + q, 7p - 3q, 11p + 5q, 11p - 3q, 11pq, Combine: 15n - 8n + 6 - 1, 7n + 7, 7n + 5, 23n + 5, 8n + 5, Combine: 3x + 4y - 2x + y - 6, x + 5y - 6, x + 3y - 6, 5x + 5y - 6, x + 5y + 6, Combine: 8a - 3b + 5a + 2b - 4, 13a + b - 4, 3a - b - 4, 13a - b - 4, 13a - 5b - 4, Combine: 11r + 6 - 4r + 3s - 2 + s, 7r + 4s - 4, 15r + 4s + 8, 7r + 2s + 4, 7r + 4s + 4

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