Answer: OPTION C.
Step-by-step explanation:
Given the following expression:

You can simplify this expression applying these steps:
First step: You must apply Distributive property:
Second step: You need to add the like terms.
Then, you get:
You can observe that this simplified expression matches with the expression provided in Option C.
Answer:
129 = x
Step-by-step explanation:
The exterior angle is equal to the sum of the opposite interior angles
47+82 = x
129 = x