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2.2x-3=-1x
sry kalau nomor 2 slh
3 < 2x+1 < -3
3-1 > 2x+1-1 > -3 -1
2 > 2x > -4
------------------ ( :2)
1 > x > -2
jadi, himpunan penyelesaiannya adalah Hp = {-4<x<2}