$$\left. \begin{array} { l } { f ( x ) = 3 x + 2 g ( x ) = x ^ { 2 } - 5 , } \\ { \begin{array} { l } { f ) ( x ) } \right.$$
$\left\{\begin{matrix}\\x=0\text{, }&\text{unconditionally}\\x\in \mathrm{C}\text{, }&f=2g+3\end{matrix}\right.$
$\left\{\begin{matrix}\\x=0\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }&f=2g+3\end{matrix}\right.$
