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b. = 5p² - 3q² + pq
c. = -16a - 6b - 4a +9b
= -20a + 3b
d. = -3x³ + 7x² - 9x - 3
e. = -12k²l - 9kl² -18k²l - 8kl²
= -30k²l - 17kl²
f. = 15m³ - 25m² + 5m - 2m³ - 6m² +18m
= 13m³ - 31m² + 23m
semoga dapat membantu