Fill In Diagram Of A Boat How To Fill In The Input/ouput Diagram For...?

How to fill in the input/ouput diagram for...? - fill in diagram of a boat

g (x) = 3-2x, find g (-2) -3
Input / Output graph of g (x) = 2x-3 is:
X -> X-1 -> x2 -> 3 -> g (x)

in which the initial g (-2) -3