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b. (3x + 5) - (2 - 2x) = 3x + 5 - 2 + 2x = 5x + 3
c. (9a - 7) - (2a + 3) = 9a - 7 - 2a - 3 = 7a - 10
d. (4x - 2) - (-x - 3) = 4x - 2 + x + 3 = 5x + 1
e. (a - 4) - (-3 + 2) = a - 4 + 3 - 2 = a - 3
f. (5x + 4) - (-4x + 7) = 5x + 4 + 4x - 7 = 9x - 3