# How to substitute a value into an expression without evaluation to convert it to LaTex?

How can I convert an expression to LaTex while substituting a variable value without evaluating the expression after substitution?

For example,
I have an expression `5*x*y`

.
The `latex(5*x*y)`

is `5 \, x y`

as expected.
But now I want to substitute a constant instead of a variable.
For example `8`

instead of `x`

.
The LaTex representation (`latex((5*x*y).subs(x=8))`

)
of which is would be `40 \, y`

, so the expression is automatically evaluated.
But I want to get something like `5 \\cdot 8 y`

instead.
Is that possible to do with SageMath?

I know something like that exists in SymPy. For example, take a look at the answer to:

It uses `sympy.UnevaluatedExpr`

to wrap an expression to substitute the variable with.
Is there anything like that in SageMath?

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