The angles are vertical angles. Vertical angles measure the same. That means:
![2 + 3x = 62](https://img.qammunity.org/2019/formulas/mathematics/middle-school/2l2k71mwdp0kdpwh6xfxlw4yne23v6qy92.png)
Switch it around and it becomes:
![62 - 2 = 3x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/w0m6s187inxsg5bq1mo7fgocxlzbqkf59z.png)
The sign changes. At first you were adding, and now you're subtracting. Subtract:
![62 - 2 = 60 \\ 3x = 60](https://img.qammunity.org/2019/formulas/mathematics/middle-school/albqug2j78tq3kz2e0dzamz8vsgqo4nxvi.png)
Divide both sides by 3 to leave the variable alone:
![60 / 3 = 20 \\ 3x / 3 = x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/xuok9z2gwt2iasveu10vkopzqbqhuhdv91.png)
That means x = 20°