Answer:
x=4
Explanation:
The sum of the interior angles opposite the exterior angle of a triangle are equal to that exterior angle
11x-2 + 9x+1 = 19x+3
20x -1 = 19x+3
Subtract 19x from each side
20x-19x -1 = 19x-19x+3
x-1 =3
Add 1 to each side
x-1+1 =3+1
x=4