How to find values that generate a particular boolean expression

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On question 1 of our homework we are asked to find which values of the boolean variables equate to the resulting boolean expression. I tried finding resources on how to complete this but I came up short. If anybody is able to help me through this problem I’d greatly appreciate it!

For which values of the boolean variables x, y, and z does
    a) x + y + z = xyz

    b) x(y + z) = x + yz

    c) x’y’z’ = x + y + z

Me and my friend came up with these answers:

a) x=y=z = 1
b) x = 0, y = 1, z = 0 or 1
c) x=y=z = 0