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A PDF file doesn't contain "text" or "images". It contains instructions of the form "draw such-and-such a shape at such-and-such coordinates". That's why, as the previous poster very rightly advised you, the best way to "edit" a PDF is often to OCR it.
PDF isn't like a word processor document or an eBook; it's a digital representation of a printed page. It knows nothing about about paragraphs, lines, words, or images.
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