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Question: How to modify an differential equation which passed to a procedure?

Question:How to modify an differential equation which passed to a procedure?

conficker 15 Maple
August 04 2019
3

Hey, I need to modify a differential equation passed to a procedure. My problem is that this code works fine:

restart;
ode := diff(y(x), x) = y(x):
y := unapply(exp(x), x):
ode;
                        exp(x) = exp(x)

But this doesn't:

restart;
ode := diff(y(x), x) = y(x);
p1 := proc (eq)
    local y;
    y := unapply(exp(x), x);
    eq
end proc:
p1(ode);
                         d             
                        --- y(x) = y(x)
                         dx

How to solve this problem? 
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