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1) -x + 3y² - 7
2) y² + 2x - 1
3) 4x - 3y² - 2z
2) 2y²-x+4-y²+3x-5 = 2y²-y²-x+3x+4-5 = x²+2x-1
3) 6x-4y²+z-2x+y²-3z = 6x-2x-4y²+y²+z-3z = 4x-3y²-2z