Boolean algebra help
 

Hello,

not sure if it's ok to ask this here. I need to simplify a boolean algebra expression.

x'y'w'z' + x'yw'z' + xw'z' + x w + x'y'w'z + x'y'wz + x'y'wz'

after doing some operations the expressioon is like this

x' y' + zw' + zx + xw

My questions are

1) is this ok so far?
2) can the expression get simple? how/wich rules apply?

Thanks.