How to remove a specific line on a text file base on 2 user inputs with Python?

So far this is what I have. I'm trying to make it so that the program asks for the user to input the author of a book and the ISBN of a book, then if there is a line in the file that contains both of these variables, it will remove that line completely.

print()
            print("Removing a Book")
            print()
            removebookAuthor=(input("Provide the author of the book you would like to remove>"))
            removebookISBN=(input("Provide the ISBN of the book you would like to remove>"))
            with open("books.txt","r+") as f:
                new_f = f.readlines()
                f.seek(2)
                for line in new_f:
                    if "removebookAuthor"+"removebookISBN" in line:
                        f.write(line)
                f.truncate()

For reference, the text document looks something like this:

Python Crash Course - 2nd Edition;Matthes,Eric;978-1593279288;005.133/MAT;12;8;
Python for Dummies;Maruch,Stef;978-0471778646;005.133/MAR;5;0;
Beginning Programming with Python for Dummies;Mueller,John Paul;978-1119457893;005.133/MUE;7;5;
Beginning COBOL for Programmers;Coughlan,Michael;978-1430262534;005.133/COU;1;0;

Example of removebookAuthor would be "Maruch,Stef" Example of removebookISBN would be "978-0471778646"

So far, the program completely clears the entire document. Not too sure how to go about fixing this. Help would be appreciated!

Your if condition is not written correctly. You could use not in for your both conditions:

removebookAuthor = input("Provide the author of the book you would like to remove>")
removebookISBN = input("Provide the ISBN of the book you would like to remove>")

with open("books.txt", "r+") as f:
    lines = f.readlines()
    f.seek(2)
    for line in lines:
        if removebookAuthor not in line and removebookISBN not in line:
            f.write(line)
    f.truncate()