how to show default featured image for every post

in this post i want to clear readers, how to show default featured image for every post if there is not Set featured image for the post, then if user want to display a default or coming soon image for every post.
you will use this code and put into the function.php file and replace the default image path.

if featured image is set show the featured image otherwise show the Default image for all post, if no featured image is set by author.

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