Answer:
[tex] \boxed{ \sf{x = 18}}[/tex]
Step-by-step explanation:
As we know that the sum of all interior angles of a triangle and the angle in a straight line is 180°.
Therefore,
- 5x-11+2x+20 = 11x-63
- 5x+2x-11x = -63+11-20
- 7x-11x = -83+11
- -4x = -72
- x = -72/-4
- x = 18
