9514 1404 393
Answer:
x = (23 4/7)°
Step-by-step explanation:
The sum of angles in a triangle is 180°.
(3x+20°) +(2x -5°) +2x = 180°
7x +15° = 180°
7x = 165° . . . . . . . . subtract 15°
x = 23 4/7° . . . . . . divide by 7
_____
Check
3x +20° = 90 5/7°
2x-5° = 42 1/7°
2x = 47 1/7°
The total is 179 7/7° = 180°, as required.
