Get Attachment ID from media_sideload_image()

Problem

In this scenario,

$image = media_sideload_image($downloadable_path, $post_id);

The $image variable now returns the full HTML, like this (with single quotes for some reason)

<img src="http://www.somesite.com/wp-content/uploads/2012/11/image8.jpg" alt="" />

Which isn’t so bad, unless we want to get Just the image URL, or maybe the Thumbnail URL, or just the attachment ID.
Here is how to do it.
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