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b) 6ab + abr = ab (6 + r)
c) 21bk - 35bm + 49by = 7b (3k - 5m +7y)
d) 5x² + 8x = x (5x + 8)
e) 4cf + 18cr + 14 cm = 2c (2f + 9r + 7m)
f) 12dn - 14de + 62dw = 2d (6n - 7e + 31w)