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b. 18p²q + 9pq² = 9pq (2p + q)
c. 6m²n + 3mn - 9mn² = 3mn (2m + 1 - 3n)
d. 5abc - 10b - 15bc = 5b (ac - 2 - 3c)
e. 6x²y³ + 24x³y² = 6x²y² (y + 4x)
f. pqr + p²q²r² + p³q³r³ = pqr (1 + pqr + p²q²r²)
c. 4a² - 9b² = (2a + 3b)(2a - 3b)
d. 16x² - 25 = (4a + 5)(4a - 5)