.
This equation is as simple as
12 + x = 2*23.
The solution to this equation is as simple as
x = 2*23 - 12 = 46 - 12 = 34. ANSWER
And my final notice is that the instruction of the last sentence is, in my view, a NONSENSE, which does not make it easier
NEITHER writing NOR solving such equation.
In my view (again), this instruction should be IGNORED and ERASED / DELETED from the post, to make the formulation PROFESSIONAL
and to leave the room for the student's creativity.