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case 1 :
2x - 1 < x + 1
2x - x < 1 + 1
x < 2
case 2 :
x + 1 < 3 - x
x + x < 3 - 1
2x < 2
x < 1
irisan dari kedua solusi di atas adalah :
x < 1
---------solusi------(1)----------
jadi, Hp = {x < 1, x € real}