Answer:
x=2.
Step-by-step explanation:
1) if the given points are (-3;5) and (7;5), then the required axis of symmetry is vertical. Then
2) the required axis intersects the section between (-3;5) and (7;5) in its midpoint;
3) the coordinates of the midpoint above are (2;5), then the required axis is:
x=2.
