Answer is:
A. 6x = 13
Step-by-step explanation:
The next step after 6x+10=23 is to subtract 10 on both sides so you’ll be only left with your coefficient and variable which is 6x on one side and your constant on the other side.
6x + 10 = 23
6x + 10 - 10 = 23 - 10
6x = 23-10
6x = 13
Hope this helped :3