Question: I want to omit the independent variable and use the "alias" but nothing happened

I want to omit the independent variable

 

for example:

> alias(f = f(x+y, z+y));
print(`output redirected...`); # input placeholder
                               f
> f1 := z = f(x+y, z+y);
print(`output redirected...`); # input placeholder
                             z = f
> implicitdiff(f1, z, x, x);

Then it get the answer:


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