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b. 7x² - 6y - 3x + 2y = 7x² - 4y - 3x
c. (3x² - 7x + 1) - (x² - 3x + 4) = 2x² - 4x - 3
d. 2x² + 5x + x² - 3x + 4 = 3x² + 2x + 4