Maybe I have to explain a little bit more..
Mathematics, formulas and equal things are international, understandable by everyone, without importance from which country you come.
So, the language, the syntax used, is very important. It's not possible to say "doesn't matter, you understand what I want to say..". No, that is something we can do between you and I, or in this forum. But not explaining a formula to calculate x or y, there you have to be serious.