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<=> -3x ≥0-12
<=> -3x ≥ -12
<=> x ≤ 4
Sorry kalo salah,,
<=> -3x+12+12 > 0+12
<=> -3+24 > -12
<=> -3 > 24+-12
<=> -3 > 12
<=> x > 12/-3
<=> x > -4