I don't know, at this moment, what it means for something to be made real just by a set of equations. An equation can determine the future without that future h

I don't know, at this moment, what it means for something to be made real just by a set of equations. An equation can determine the future without that future having taken place. "being real", to me, means "being observable." If I can't observe/measure it, is it real? This seems like a philosophical conversation.