Describe fully a sequence of transformations that map the line \(y = x\) onto the line
$$y = 10 - 2 x$$
The function f is defined as \(\mathrm { f } : x \rightarrow 10 - 2 x , x \in R , x \geq 0\).
The function ff is denoted by g .
Find \(\mathrm { g } ( x )\), giving your answer in a form without brackets.