Answer:
(5x-11)+(11x-63)+(2x+20)
Step-by-step explanation:
If you have to solve for it then just add all your like terms into a simplified equation. 18x-54 would be the simplified version
11x-63=(5x-11)+(2x+20)
x=18
external angle Theorem: The external angle is equal the sum of the two other internal angles.
Then we have this equation:
Solving this:
11x=63+7x+9
4x=72
