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