Answer:
x = 17
Step-by-step explanation:
Angle sum property of triangle
/ a + / b + / c = 180°
Similarly,
(5x + 2) + (4x + 8) + x = 180
5x + 2 + 4x + 8 + x = 180
(5x + 4x + x) + (2 + 8) = 180
10x + 10 = 180
10x = 180 - 10
10x = 170
x = 170 / 10
x = 17
