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= 4x^-x^ + 6x-2x
= 3x^ + 4x
2.= 9a-5a+4b+3b
= 4a + 7b
3.=4p-7p-5pq-pd+6
= -3p - 6pd + 6
4.= 5a + 3b + 8x -4y
5.= 4y-6y+7z+9z
= -2y + 16z