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3x - 4 < x
3x -x < 4
2x < 4
X < 2
Dan
3x - 4 > -x
3x + x > 4
4x > 4
X > 1
Jadi HP : { x | 1 < x < 2 }
-x < 3x-4 < x
Dipecah jadi dua,
3x-4 < x
2x < 4
x < 2
Atau
-x < 3x-4
-4x < -4
x > 1
Maka,
HP = {1 < x < 2}