6a - 2b + 2b - a, 5a, 7x + 5y + x - 12y +3y, 8x − 4y, 4 - 5b + 9c - 2 + 2b - c, −3b + 8c + 2, 0.7 - 8x + 9y  - 0.2 - 4y, −8x +5y +0.5, 0.4 + 3j - 2k + 2 + j +7k, 4j +5k + 2.4, 7.5m + 5n - 2m + n + 1.7m, 7.2 m + 6n, 18t + u - 7u + 12t , 30t − 6u.

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