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3x ≥ -12
x ≥ -4
-x - 2x ≤ 15 - 3
-3x ≤ 12
x ≥ 12 : (-3)
x ≥ -4
Nilai x yang memenuhi : (-3 , -2 , -1 ,0 , 1 , 2 ,3 ....)