i have a question and i am stuck on the first part was wondering if you could help.

LetRbe the set of real numbers. Define a relation R(subscript1) on the setRas follows: m R(subscript1) n whenever n-m congruent to 0(mod24).

First off how do i define this relation?

I then have to proove R(subscript1) is an equivalence relation but i want to give this a bash first once i managed to define the relation.