$x \times \left( x-6 \right)=0$
When the product of factors equals $0$, at least one factor is $0$$\begin{array} { l }x=0,\\x-6=0\end{array}$
Solve the equation for $x$$\begin{array} { l }x=0,\\x=6\end{array}$
The equation has $2$ solutions$\begin{array} { l }x_1=0,& x_2=6\end{array}$