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1/3[2(3-4x)] + ½[-3(x+1)]≤ 0
1/3[6-8x] + 1/2[-3x-3]≤ 0
2-8/3x-3/2x-3/2≤ 0
½-25/6x≤ 0
-25/6x≤ -1/2
x≥3/25
Odp: {3,8,12}