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2. X4_4x2y2+2x2y2-8y4 =x4-2x2y2-8y4
3. 2x2y2-14x2y-10x2y+35x2 = 2x2y2-24x2y+35x2
4. 9x2+12x+12x+16 = 9x2+24x+16
5. 25x2+10x+10x+4 = 25x2+20x+4
6. 16x2-12x-12x+9 = 16x2-24x+9
7. 25x2-25x-25x+25 = 25x2-50x+25
8. 4x2-10x+10x-25 = 4x2-25
9. 16x2+12x-12x-9 = 16x2-9
10. 25x2-10xy+10xy-4y2 = 25x2-4y2