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6x + 18 ≤ 10x - 10
18 + 10 ≤ 10x - 6x
28 ≤ 4x
7 ≤ x
6x + 18 ≤ 10x - 10
18 + 10 ≤ 10x - 6x
28 ≤ 4x
7 ≤ x