An in-line mathematical formula does not have to be on a line of its own.

[…]And take his bottle from him. / When that's gone, / He shall drink naught but brine, for I'll not show him / Where the quick freshes are.

The original accused device, as was the patented device, was made of cotton flannel with a nappy surface on each side, […] .

While likely an overt reference to Gendry's Baratheon heritage, but many Gendrya shippers also hope that secret has something to do with the younger Stark sister.