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5.
a. 5a + 8 + 8a + 3 = 13a + 11

b. 6a - 5b - 2c + (-8a) + 6b + 9c = -2a + b + 7c

c. 20p² - 15p + 21p² + 28p = 41p² + 13p

6.

a. 9p + 12 - (7p + 14) = 9p + 12 - 7p -14 = 2p - 2

b. 11p² - 17p + 24 - (2p² + 15p - 18) = 11p² - 17p + 24 - 2p² - 15p + 18 = 9p² - 32p + 42

7.

a. 3x + 5y + 4x - 2y = 7x + 3y
b. 3x + 5y - (4x - 2y) = 3x + 5y - 4x + 2y = -x + 7y