[Python] How do I display a full expression in sympy?

I am trying to use SymPy in a Jupyter notebook to document and perform a series of mathematical calculations in a reproducible way.

If I define the following:

from sympy import *

init_printing()
x, y, z = symbols("x y z")

x=y+z
x


then I can display the value of x (that is, y+z).

How do I display the full equation (x=y+z)?

Running Eq(x,y+z), even with evaluate=False) returns the expression with the value of x substituted (y+z=y+z).

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