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(i) x+2>0のとき。
x+2>3x
2x<2
x<1
x+2>0と合わせて-2<x<1
(ii)x+2≦0のとき。
-x-2>3x
4x<-2
x<-1/2
x+2≦0と合わせてx≦-2
(i)と(ii)より、x<-1
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