|x+2| + |x-2|
(1) x>2
左边= x+2 + x - 2 = 2x=右边=6 => x = 3
(2)x x = -3
(3)-2 无解结论呢，，，，已经出来了啊，，结果不是告诉你了，，两个解x=3或x=-3