Reduce the boolean expression as much as possible

[dba]

Homework Statement

Reduce,
x(w+y'+z') + (w+x)y'z + wx'yz + wxy

Homework Equations

+ stands for OR
* (multiplication) stands for AND
' NOT

The Attempt at a Solution

I tried to combine some terms but I cannot find a good start...
x(w+y'+z') + (w+x)y'z + wx'yz + wxy
= xw + xy'+ xz' + wy'z + xy'z + wx'yz + wxy

I do not see what I can do. Any hint would be great. I thought maybe multiplication with one or addition of zero would help but nothing seems to work.
Some rules are x+x=1 x+1=1 x+x'=1 x*x'=0

Thanks for any help.

 

[vela]

Show us what you have so far. I can see a couple of terms you can get rid of using the rules you've already listed.

You may find the relation a+a'b = a+b useful.