1. (-7x2 + 14 + 2x) + (10x + 7 - 5x)
2. (-9x3 - x2-3x - x4 - x) + (-6x4 - x - x - x3 - 3x2)
3. (33x4 + 7x2 + 10x3) + (3x4 + 19x5 + x + 6x2 + 2x)
4. (11x5 - 25x - 4x4 + 3x2 + x) + (-7x3 - 2x+ + 15x)
5.(9x5 - 8x + x - 4 - 5x2) + (4 + 8x6- X - 9x)


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