Parse Error in Header.php line 51

I keep getting this error when trying to view site in the browser.

Parse error: syntax error, unexpected ‘(‘ in /home/content/54/7002354/html/wordpress/wp-content/themes/Black-Casino/Black-Casino/header.php on line 51

My biggest problem is that I don’t know how to figure out what is what line! I have done a lot of manipulating of the header file in order to get my logo in, but I am not sure what is going on and I don’t remember anything going wrong while changing it. I always check after each line I change to make sure everything is okay. When I went to continue this morning, this is what I keep getting.

Can someone please help, and please explain to me how I figure out what a number each line is. I am by far not an expert on this coding thing!