How do I find the value of x??

Witch represents the inverse of the function f(x)=1/4x-12

Ineed with this problem 21 show steps

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m