To solve for color(orange)vv you need to first isolate it on one side of the equation. This equation is set up to leave the color(orange)vv on the right side.
In the equation, color(orange)vv is being divided by color(brown)1616. To solve the equation, we need to do the opposite -- which is multiplying by color(brown)1616.
color(red)4=color(orange)v/color(brown)164=v16
color(red)4*color(brown)16=(color(orange)v/color(brown)16)*color(brown)164⋅16=(v16)⋅16
color(red)64=color(orange)v64=v