Hi there!
Answer:
C. Addition property of equality
Explanation:
Addition property of equality: a+b=a+c
First, you add by 7 from both sides of an equation.

Then, you add by the numbers from left to right.

Therefore, the final answer is x=17.
I hope this helps you!
Have a nice day! :)
:D
-Charlie
Thank you so much! :)
:D