pls help for 50 points NO WEBSITES please help

Answer:
Solution: [tex]4\frac{3}{4}[/tex], 3.5, -15, 5
Not a solution: 129 and [tex]10\frac{2}{3}[/tex]
Step-by-step explanation:
20 ≥ 5 + 3x
3x + 5 ≤ 20
3x ≤ 20 - 5
3x ≤ 15
x ≤ 5
x must be LESS than or EQUAL to 5