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Question: confused on this affine cipher ciphertext only attack i am...

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Confused on this affine cipher, ciphertext only attack. I am just confused with the underlined steps below, can someone explain where the 7 comes from?

I have been able to follow all the steps leading up to this point.Thus we set kade)-b, kap(t)-y and derive (a, β): (αe+β-b·at+β-y), this means (4α+β-1, 19α+β-24), and hence 15a23 23-161-5 B-7; thus the key is very likely to be k-(5,7)

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