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b) xy + 3y = y (x + 3)
c) 16a²b - 12 ab² = 4ab (4a - 3b)
d) 20 p²qr² - 15p³qr = 5p²qr (4r - 3p)
e) 4(3a - 2b) + 2a (3a - 2b) = (4 + 2a) (3a - 2b)
= 2 (2 + a) (3a - 2b)