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-(2-x) < 2x -1 < 2 - x
x -2 < 2x -1 < 2 - x
...
dengan dua tahap
x-2 < 2x -1
-x < 1
x > -1
.
2x -1 < 2 - x
3x <,3
x < 1
..
irisn Hp -1 < x < 1