Hello there!
2x - 7 = 3
Solve for x
2x = 3 + 7
2x = 10
x = 10/2
x = 5
Therefore, the number of x in the equation is 5
Let me know if you have additional question!
Answer:

Step-by-step explanation:
Diameter = 12
Radius = 12/2 = 6


The answer is 39 degrees <span />
Divide by each number below it and find that each does not come out to a whole number except for dividing by 1