1. The question asks to add 7000 meters and 3 kilometers together, and the unit of the total length should be in kilometers.
2. First, convert 7000 meters to kilometers. Since 1 kilometer is equal to 1000 meters, 7000 meters is equal to 7 kilometers.
3. Then, add the converted 7 kilometers to the given 3 kilometers, 7 kilometers plus 3 kilometers equals 10 kilometers.
4. Therefore, 7000 meters plus 3 kilometers equals 10 kilometers.
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