Given

⇒ 30 – 10x ≥ x + 20

⇒ x + 20 ≤ 30 – 10x

⇒ x + 20 – 20 ≤ 30 – 10x – 20

⇒ x ≤ 10 – 10x

⇒ x + 10x ≤ 10 – 10x + 10x

⇒ 11x ≤ 10

Thus, the solution of the given inequation is.