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10x - 8x
2x
10x+4y-y
10x + 3y
6b-3b+8a-18b+a
8a + a + 6b - 3b - 18b
9a + 6b - 21b
9a - 15b
3x – 7y + 5x + 4y
3x + 5x - 7y + 4y
8x - 3y
9z + 8zy² – 5z + zy² – 15xy²
4z + 9zy² - 15xy²