Answer: 23
step by step:
The angle is 90 degrees
(2x+14) + (x+7) = 90
(2x+ x) + (14+7) = 90
3x+21 = 90 (subtract 21 from both sides)
3x+ 21 - 21 = 90 - 21
3x = 69 ( divide each side by 3)
x = 23
