PLEASE HELP! I WILL GIVE BRAINLIEST!
What is the value of x.

Answer:
A 21
Step-by-step explanation:
The angles are vertical angles, so
64 = 3x+1
Subtract 1 from each side
64-1= 3x+1-1
63 = 3x
Divide by 3
63/3 = 3x/3
21 =x