The image you want to remove is not held in an img element as far as I can see. The only reference to it in the code you give is as a background-image.
Therefore, display: none is not appropriate as you would be getting rid of the whole element which may not be what you want.
This particular page has a class of postid-18069 and that seems to be the only way of making sure you are going to get rid of the background image on this page only.
So the CSS needs to be something like:
.postid-18069 div.wraper_inner_banner {
background-image: none !important;
}
Sadly the !important is probably needed here as otherwise the inline style will overwrite things.
I think that selection is enough, but if not put in more things that come between the .postid-18069 and the background-image div.
Note: this looks like some sort of CMS site (?wordpress?). If so be aware that the postid of that page might change so I am not happy that this is a caste-iron way of removing that image. It might be better to look at the single.php for that site (or whatever is generating that page) and remove having that image, but we'd need to know more about the circumstances before looking into that.
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