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b. 5p² + 2q² - 4pq
c. -16a - 6b - 4a + 9b
-20a + 3b
d. -3x³ - 2x² - 3
e. -12k²l - 9kl² + 18k²l - 8kl²
6k²l - 17kl²
f. 15m³ - 25m² + 5m - 2m³ - 8m² + 18m
13m³ - 33m² + 23m