1. 28x2 - 7x
2. 81x12 - 3x8
3. (4x2 + 26x) = 2x
4. (35x3 + 14x2 - 28 ) = (-7)
5. (16x4 + 20x3 + 4x2 ) = 4x2
6. (3x3 + 3x2 - 11x + 21 ) + (x + 3)
7. (x3 + 8x2 + 21x + 54 ) + ( x + 6)
8. (7x2 - 26x - 45 ) + (x - 5)
9. (6x3 + 11x2 + 8x + 20 ) + (x + 2)
10. (9x3 - 65x2 - 64x + 64 ) + ( x-8)
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