Penyelesaian dari x-2<3x+1<2-x

x -2 <3x + 1<2-x
1)
x-2 < 3x +1
 2x > -3
   x > -3/2
2)
3x + 1<2-x
4x < 1
  x < 1/4

x-2<3x+1<2-x
x+x-2<3x+x+1<2-x+x
2x-2<4x+1<2
2x-4x-2<4x-4x+1<2
-2x-2<1<3
-2x-2+2<1+2<3+2
-2x<3<5
x<-3/2<-5/2


itu kalau menurutku.