分情况讨论：
2x+3>2x-5
1、当2x-5>0(x>5/2) 2x+3>0(x>-3/2)
2x+3-2x+5>6
8>6
则2x-5>0即可,x>5/2
2、当2x-5-3/2)
2x+3-(-2x+5)>6
4x>8
x>2
则2