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2(3p + 4q)
d) 5x²y⁴ - 10x³ y²
5x²y²(y² - 2x)
e) 7ab³c⁴ + 28a²b²c²
7abc(b²c³ + 4abc)
2. a) 9pq - 12pr + 18pqr
3p(3q - 4r + 6qr)
b) 14a²b³c + 8a²c - 16abc
2ac(7ab³ + 4a - 8b)
c) 10x⁴y²z³ - 20x²y³z² + 15x²y⁴z²
5x²y²z²(2x²z - 4y + 3y²)