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(=) 2/5 x - 3 ≤ 6 - 1/2 x
(=) 2/5 x + 1/2 x ≤ 6 + 3
(=) 4/10 x + 5/10 ≤ 9
(=) 9/10 x ≤ 9
(=) 9x ≤ 9 * 10
(=) x ≤ 90/9
(=) x ≤ 10
Jadi, nilai x yang memenuhi adalah 10