What is the property of this equation? if 2x=8 then x=4

Answer is 2 x 4=8 this is a scientific property

Graph the parabola using the direction, vertex, focus, and axis of symmetry.
Direction: Opens Up
Vertex: (−5/8,−41/16)
Focus: (−5/8,−5/2)
Axis of Symmetry: x=−5/8
Directrix: y=−21/8   x.        y
−3.       20
−2.        5
−5/8.    −41/16
 0.          −1
1.           8