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I am a little consufed in basic set theory

Let $A = \{\{x\},y,z\}$, $B= \{z,\{y\},x\}$.

Are they equal?

I am clear about that order does not matter, but can we prove they are equal or not?

I am little confused in $\{x\}$ and $x$, how to compare them?

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    Well, $\{x\}\in A$. Is $\{x\}\in B$? Do you think $\{x\}=x$?2012-12-28
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    All these words are written here below just for two braces in each sides. How wonderful mathematics is. :)2012-12-28

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