To convert the scale from one box equals 6 meters to one box equals 3 meters, we need to determine how many boxes will represent the same length in the new scale.
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Determine the total length represented by 7 boxes at the original scale (6 m per box):
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Convert this length to the new scale (3 m per box):
So, the new drawing will have a length of 14 boxes. Therefore, the answer is 14.