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4. 7x² - 4x² + 3y - 6y = 3x² - 3y
6. 4 (3p + 2) - 6p = 12p + 8 - 6p = 12p - 6p + 8 = 6p + 8
8. 6p + 2 (7p - 2q) = 6p + 14p - 4q = 20p - 4q
10. - 3 (x - 4y) + 4 (5x - 3y) = - 3x + 4y + 20x - 12y = - 3x + 20x + 4y - 12y = 17x - 8y