由题意，得
2x+6≥0-2x＞0，
解得：-3≤x＜0．
∴故答案为：-3≤x＜0．
The shoes made in Chengdu are usually of high quality, so they _____ long.[ ]
A. wore
B. are worn
C. wear
D. will be worn
检查焊缝机安全制动开关是否正常是（）必做的内容。
A、日常检查
B、设备一级保养
C、设备二级保养
D、设备月保养
