Answer:
x = 9
Step-by-step explanation:
Exterior angle property of triangle: Exterior angle equals sum of opposite interior angles.
9x + 14 = 5x + 5 + 45
9x + 14 = 5x + 50
Subtract 14 from both sides
9x = 5x + 50 - 14
9x = 5x + 36
Subtract 5x from both sides
9x- 5x = 36
4x = 36
Divide both sides by 4
x = 36/4
x =9
