Apart from math teachers I dont know of many people who use algebra (in its purest form) in their daily lives.
Algebra is know as a 'gatekeeper' subject which basically means that it helps you get into careers while keeping other people who cant do it, out.
It develops absract reasoning which is very hard to develop elsewhere and to some degree, its used in basically every job on the planet.
Most of the time you use it without even realising, like at the bank, grocery store or buying dinner and splitting the check (of course they dont have full classes on such basic stuff) and if it wasnt for school or learning from your parents or whoever you wouldnt know it.