The following code:

    HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
    doc.Load(yourHtml);

    foreach (HtmlNode node in doc.DocumentNode.SelectNodes("//img"))
    {
        Console.WriteLine(HtmlEntity.DeEntitize(node.NextSibling.InnerText).Trim());
    }

Will output:

x 3
1
x 1
x 1

Note the HtmlEntity utility that eases the handling of HTML entities (like  )