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# of blue marbles: w
# of red marbles: 2w
# of red and blue marbles packed into the 9 bags: 2w-6+w = 3w-6
a) # of marbles in each bag: (3w-6)/9 = (w-2)/3
b) If w = 20, # of marbles in each bag: (20-2)/3 = 18/3 = 6

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