$\begin{array} { l }{x}^{2}-8x+14=2,\\{x}^{2}-8x+14=-2\end{array}$
Solve the equation for $x$$\begin{array} { l }x=2,\\x=6,\\{x}^{2}-8x+14=-2\end{array}$
Solve the equation for $x$$\begin{array} { l }x=2,\\x=6,\\x=4\end{array}$
The equation has $3$ solutions$\begin{array} { l }x_1=2,& x_2=4,& x_3=6\end{array}$