The solution accepted anywhere but in the US school system range from “Bloody use parenthesis, then” over “Why is there more than one division in this formula why didn’t you re-arrange everything to be less confusing” to “50 Hertz, in base units, are 50s-1”.

No, the solution is learn the rules of Maths. You can find them in Maths textbooks.

so no actual mathematician, or other people using maths in earnest, use that kind of notation.

Yes we do, and it’s what we teach students to do.