Answer:
x°= 18°.
Explanation:
The angle that forms when you combine the angle to the left of the vertical line and to the right, the resulting angle will measure 180°. Check the attched image to better understand this concept.
1. Form an equation.
Knowing that the sum of the total angle of the 2 angles has to equal 180°, we can take the expression of each angle, sum them up and equal to 180°.
(6x+20)°+(3x-2)°=180°
2. Solve the equation.

3. Express your result.
x°= 18°.
4. Verify your result.
If our equation is correct, it should equal 180° when we susbtitute the value of x by 18°. Let's test it:
(6(18°)+20)°+(3(18°)-2)°=180° --> This is correct, hence, our answer is correct