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have you tied including the full URL to the php file?
eg
include('"http://www.yourdomain.com/substract.php?a=19&b=5");
Also if the file is just calling a fucntion in subtract.php you can include the file and then call the fucntion in the intial script.
eg.
include('subtract.php');
subtract(5,6);
where subtract is the function within subtract.php
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