[sarcasm]Here is an example of a clearly worded question.[/sarcasm]So for the coordinates (x, y) x is x/2 -2
You probably mean that one considers some point (x, y) lying on the graph of y = -2f(x). The question is, for what x' the point (x', y) lies on the graph of y = -2f(2x + 4)? This happens when 2x' + 4 = x, i.e., when x' = x/2 - 2.