There is a piece of iron wire. For the first time, more than half of it is used. For the second time, the remaining half is less than 1 meter. At this time, there are still 3.5 meters left. How long is the original length of the iron wire?

12 meters
Just push it back
The remaining 3.5 meters, then before the second use is (3.5-1) x2 = 5 meters, before the first use is (5 + 1) x2 = 12 meters

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