Answer:
x = 80
Explanation:
the sum of the interior angles of a polygon is
sum = 180° (n - 2 ) ← n is the number of sides
A hwxagon has 6 sides , then
sum = 180° × (6 - 2) = 180° × 4 = 720°
sum the 6 angles, equate to 720 and solve for x
x + x - 5 + x - 5 + 2x - 5 + 2x - 5 + 2x + 20 = 720 ( simplify left side )
9x = 720 ( divide both sides by 9 )
x = 80