each
triangles equal each to each

eq.
equal

equal
your attitude is equal to his

footing
to be on an equal footing with

let
let AB be equal to CD

minus
...three is equal to four / seven minus three leaves four

nothing
three times nothing is equal to nothing

other
other things being equal

proportion
in equal proportions

term
on equal terms / on the same terms

thing
all (other) things being equal