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= 6p - 8p - 5q + 6q - 2r + 9r
= -2p + q + 7r
b. 2(3a + 5b + 3) + 4(2b - 3a + 6) = 6a + 10b + 6 + 8b - 12a + 24
= 6a - 12a + 10b + 8b + 6 + 24
= -6a + 18b + 30
= 6p - 5q - 2r + (-8p + 6q + 9r)
= 6p - 5q - 2r - 8p + 6q + 9r
= 6p - 8p - 5q + 6q - 2r + 9r
= -2p + q + 7r
b. 2 (3a + 5b + 3) dan 4 (2b - 3a + 6)
= [(2 × 3a) (2 × 5b) (2 × 3)] + [(4 × 2b) (4 × -3a) (4 × 6)]
= 6a + 10b + 6 + (8b - 12a + 24)
= 6a + 10b + 6 + 8b - 12a + 24
= 6a - 12a + 10b + 8b + 6 + 24
= -6a + 18b + 30