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I would like to understand the basic concepts of how mathematics is builded up from sets of elements to anything else (i.e: an equation)

For example here is a formula: 2-1

So are there different sets of elements like

A=(2) B=(-) C=(1) ?

And maybe there is an operation with sets what put the two, minus and the one together?

Recently I thought the function order two elements together, but I've just realized what function does is transform a set of elements to another one like from 2 it made 2-1

2->2-1 if that's right.

So I don't understand what put elements together

I would be really grateful is anybody could help me with this

Thank you in advance!

Malna