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3x + 4x + 5y² + (-2y²) - 7
7x + 3y² - 7
2. 2y² - x + 4 - y² + 3x - 5
2y² - y² - x + 3x + 4 - 5
y² + 2x - 1
3. 6x - 4y² + z - 2x + y² - 3z
6x - 2x - 4y² + y² + z - 3z
4x - 3y² - 2z
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