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Question: what do RootOf(z2-z3-z1+_Z^3) mean?

would like to solve for x in terms of z from z in terms of x

however, x2 = RootOf(z2-z3-z1+_Z^3) , what is _Z ?

ex1 := {z1=x1, z2=x3-x2^3, z3=-x1+x3, z4=-x1+x4};
solve({z1=x1, z2=x3-x2^3, z3=-x1+x3, z4=-x1+x4},{x1,x2,x3,x4})

{x1 = z1, x2 = RootOf(z2-z3-z1+_Z^3), x3 = z3+z1, x4 = z4+z1}

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