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16)

A = 10 - (2x + 5)

A = 10 - 2x - 5

A = - 2x + 5

B = 10 + (2x - 5)

B = 10 + 2x - 5

B = 2x + 5

C = 10 - (2x - 5)

C = 10 - 2x + 5

C = - 2x + 15

17)

A = 7 + 3 (2x - 6)

A = 7 + 6x - 18

A = 6x - 11

B = 8x + (2x - 2) (3x + 1)

B = 8x + 6x² + 2x - 6x - 2

B = 6x² + 4x - 2

C = (3x * 5) (2 - 7x)

C = 15x (2 - 7x)

C = 30x - 105x²

D = 17 - (3 - x) (4x - 2)

D = 17 - (12x - 6 - 4x² + 2x)

D = 17 - 12x + 6 + 4x² - 2x

D = 4x² - 14x + 23.