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1. 
(8x2-2x+1)-(3x2+5x-8)
2. 
(2x3-3x2+5x-1)+(x2+1-3x)
3. 
(2x2+ 3x)+(3x2+7x)
4. 
(5x4+4x2)+(8x4+5x2)
5. 
8x2+2x+1)-(3x2+5x-8)