Using symbolic variables in MATLAB tf function

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AcesofSpades
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I have the transfer function z+b/z^2-1.5*z+0.7

I want to write this to MATLAB so :

syms b
h=tf([1 b],[1 -1.5 0.7],1)

The problem is that it returns an error of the variable b.
How can I define it so that I can get an answer?
 
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