Jawabanmu

2014-02-24T19:46:46+07:00
     -3x +12 ≥ 0
<=> -3x ≥0-12
<=> -3x ≥ -12
<=> x ≤ 4
Sorry kalo salah,,
2014-02-24T20:34:29+07:00
-3x+12 > 0
<=> -3x+12+12 > 0+12
<=> -3+24 > -12
<=> -3 > 24+-12
<=> -3 > 12
<=> x > 12/-3
<=> x > -4