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| -x
| dikali 3
-2x+2 < -x+1 < 7 | Dibagi 2
x+2 < 2x+1 dan 2x+ 1<3x+7
x+2+(-2) < 2x +1 +(-2) dan 2x+1+(-1) < 3x+7+(-1)
x<2x-1 dan 2x<3x+6
-x<1 dan -x<6
jadi, x>-1 dan x>-6
HP = {X | -1 < x , x ∈ real}