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Question: Substitute in procedure desn't work

Question:Substitute in procedure desn't work

TheViktor 10
procedure subs
July 30 2017
2

I have a procedure that uses substitute. Below is my code

my_proc:=proc(func::`+`)
    ... #some calculatin

    subs([x[1] = 2, x[2] = 1], func);

end proc;
func:=5 + x[1]*x[2] + 10*x[1];
my_proc(func);

But when I call the procedure, her body is no substitution. What is the error? I can't understand what I did wrong?
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