Question

20-(2x+5) menor ou igual 11+8

Answer 1

20 - (2x + 5) ≤ 11 + 8
20 - 2x - 5 ≤ 19
20 - 5 - 2x ≤ 19
15 - 2x ≤ 19
- 2x ≤ 19 - 15
- 2x ≤ 4 ( - 1)
2x ≥ - 4
x ≥ - 4/2
x ≥ - 2

{x ∈ R / x ≥ - 2}