9a - 5a + 4a, 11b + 7c - 8b + 3c +3b + 4c, 15z + 6y - 3z + 4y + 12z + 2y, 30 - (3 x 2) x 5, 12 - 4 x 3, 6a + 3b - 9a + 7b - 3a - 4b, 13b + 3 - 11b + 4 + 2b - 1, 5z + 13 - 3z + 4 + 2z + 9, 10 - (7-2) x 2, 3c + b - 8c + 2b - b - 5c, 5q - 12q -3q -4q, 17p - 8p + 9p, 4z - z + z + z + z, 19 - 9 + 5 x 2, 2k - k + 2k + 2k - 3k, 6z - 7z - z,

Collecting like terms

by Anonymous

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