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1/2x + 4 - 7 ≤ 4/5x - 6
1/2x - 3 ≤ 4/5x - 6
kalikan 2
x - 6 ≤ 8/5x - 12
kalikan 5
5x - 30 ≤ 8x - 60
5x - 8x ≤ -60 + 30
-3x ≤ -30
3x ≥ 30
x ≥ 30/3
x ≥ 10