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3x - 1 _< x + 5
2x _< 6
x _< 3
-3x + 1 _< x + 5
-4x _< 4
x >_ -1
daerahnya : -1 _< x _< 3
ps.
_< (lebih kecil sama dengan)
>_ ( lebih besar sama dengan)
sorry ya klo kurang jelas dan salah...