|x+3|>|x-5|+7分类讨论当x>=5时x+3>x-5+7 3>2 不等式恒成立当5>x>-3时x+3>5-x+7 2x>9 x>9/2 所以5>x>9/2当x<=-3时-x-3>5-x+7 -3>12 不等式恒不成立综上所述 x>9/2
