rectangular vegetable field is 7 meters long and 3 meters wide. Uncle Wang wants to surround the vegetable field with a fence. If one side is against a wall, how many meters should the fence be at least?
一块长方形菜地，长7米，宽3米，王叔叔要在菜地周围围上篱笆，如果一面靠墙，篱笆至少要多少米？
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