移项得，12x-x=4+1，
合并同类项得，-12x=5，
系数化为1，得，x=-10．
故答案为：x=-10．
Which city has _________ population, Shanghai, HongKong or Qingdao?
A. the smallest B. the most C. the largest
450克=______千克0.6米=______厘米 0.05公顷=______平方米30分钟=______小时．
