HELP with Simplifying boolean expressions?

1) (x'y'z')+(x'y'z)+(xy'z)+(xyz') 2) (x'y'z')+(x'y'z)+(x'yz)+(xy'z)+(xyz) +(xyz') 3) (a'b'c')+(a'bc')+(a'bc)+(ab'c)+(abc') +(abc) If anyone could show me the steps and solve any of those for me, I greatly appreciate it.