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x= -1, -2, -3,...
3 - 2(-1)
= 3 - (-2)
= 3 + 2 = 5.
3 - 2(-2) = 7.
dst.
-2x > 5 - 3
-2x > 2
x < 2/-2
x < -1
HP = {...,-7, -6, -5, -4, -3, -2}