The number l didn't pick?

Algebra Level pending

I have picked \(8\) of the numbers from \(1\) through \(9\) and hidden them in circles in the diagram below. Each circle has a line passing throught it; the tally line \(AB\) gives sums of the numbers on each line. Which number l didn't pick?

Problem image and content is taken from the book: Moscow Puzzles.

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