Answer:
x = 22
Step-by-step explanation:
Let's name the triangle ABC. (A being the top left corner, B = (103 - x)°, C = 2x°)
Find angle A.
180° - (6x - 7)° [adjacent angles on a straight line]
= 180° - 6x° + 7°
= (187 - 6x)°
Make an equation. In this case we have all the angles of the triangle. We can make an equation of A + B + C = 180° and then solve for x.
(187 - 6x)° + (103 - x)° + 2x° = 180°
290° - 5x° = 180°
-5x° = 180° - 290°
-5x° = -110°
x° = 22°
x = 22
