ANSWER
[tex]x = 20 \degree[/tex]
EXPLANATION
Since the line m and line n are parallel, we use the corresponding angle property to obtain the equation,
[tex](3x+5) \degree = 65 \degree[/tex]
Remember the F-pattern of the corresponding angles.
We now group like terms to obtain,
[tex]3x = 65 - 5[/tex]
We simplify the right hand side to get,
[tex]3x = 60 \degree[/tex]
We now divide both sides of the equation by 3 to obtain,
[tex]x = \frac{60}{3} [/tex]
This finally simplifies to,
[tex]x = 20 \degree[/tex]