when prove

$($x and y$)$ or $($y and z$)$ or $(($not x$)$ and z$)=$ x and y or $($not x$)$ and z

using boolean algebra $($ not truth table $),$

I can't understand $($y and x$)$ or $($z and $($y or not x$))$ becomes y and x or z and $($not x$)$

what's the reason?