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2. 15x-2y + 20x+3y
3. 6x-4 + x-y
4. x+y + 4y-8
5. 5x-y + x-1
6. x-1 - 3x-6
7. 6x-3 - 1+x
8. 18a-13y - 5a+4y
9. 8x-3y - 5x+9y
10. 10x+10y+10z - x-y-z