"Lenger" or "Lengere" meaning "Any More."

Norwegian 5, Lesson 14:

I have a problem with the following:-

“… men ikke nå lenger…” meaning “but not anymore”


“vi brukte å eie en forretning, men ikke nå lengere” meaning “we used to own a business, but not anymore.”

Why is it that in the second instance, an extra “e” for the word “lenger” is added in the sentence?

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