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2x < 3
2x - 3 < 0
maka, 2x - 3 bernilai negatif, sehingga :
-(2x - 3) < 1
-2x + 3 < 1
-2x < 1 - 3
-2x < -2
2x > 2
x > 2/2
x > 1
dengan syarat x < 3/2 dan x > 1, maka
HP = {x | 1 < x < 3/2, x ∈ R}