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6x - 8 ≤ 4x + 12
2x ≤ 20
x ≤ 10
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9x - 2 ( x + 6 ) ≤ 3x - 18
9x - 2x - 12 ≤ 3x - 18
7x - 12 ≤ 3x - 18
4x ≤ -6
x ≤ -1,5