The answer to your problem is........... 60..... i think :)
I would add like terms, meaning subtract 6.4 from both sides.
3.5n = 36.1
Her next step is to repeat the last process of drawing those two arcs. However, they will be mirrored since she swapped endpoints.
Check out the diagram below. Figure 1 is what she already has. Figure 2 is what happens after completing the next step. The red and blue arcs intersect to help form the endpoints of the perpendicular bisector. I used GeoGebra to make the diagrams.
Answer:
ksnbdndk djdbnsjsksk djdjjsksks ksksj dndjjdjsjsjkskdkd