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2x - 4y + 7z - 2y + z + 7x = 2x + 7x - 4y - 2y + 7z + z = 9x - 6y +8z
68m + 20n - 72o + 23m² -20n + 32o = 23m² + 68m + 20n - 20n - 72o + 32o = 23m² + 68m - 40o