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what's wrong?!!

Hi Mathematica community,

I try to use Case[exp,patt,Infinity]

for the first example it works:
Cases[iP == i + v && kaP == 3^v,  iP == _ | kaP == _, Infinity]
the output is  {iP == i + v, kaP == 3^v}

but not for the second one!!
 Cases[yP == y + x - z, yP == _, Infinity]
the output is  {}


Thank you.

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