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Answer: Step 1: Select any 6 marbles. Place 3 marbles on each side of the scale. If one side goes down, go to Step 3. If they balance go to Step 2.

Step 2: Place the two remaining marbles on the scale. The marble that goes down is the heavy marble.

Step 3: Using the 3 marbles that went down in Step 1, select any 2 marbles. Place one marble on each side. If one side goes down, that is the heavy marble. If they balance the other marble is the heavy marble.