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= 3x < -3x - 3 + 7 + 2
= 3x < -3x + 6
= 3x+3x< 6
= 6x < 6
= x < 1
3x-2 < -3x-3+7
3x-2 < -3x+4
3x+3x < 4+2
6x < 6
x < 6:6
x < 1
HP = {...,-2,-1,0}