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= 7x - 6x + 3y - 3y
= x
2. x² - x + 3x² - 5x
= x² + 3x² - x - 5x
= 4x² - 6x
3. x² - 2x + 6 - 2x² - 3x - 1
= x² - 2x² - 2x - 3x + 6 - 1
= -x² - 5x + 5