What is the inverse of the function f (x) = / sqrt[3]{7x-21}-3f (x) = 3 7x-21 - 3f, (, x,), equals, root, start index, 3, end index, square root of, 7, x, minus, 21, end square root, minus, 3?

given the equation is written in text so the signs and operators are weird, i don't understand the question but an inverse of any function can be found by switching f (x) or y with x.

For example if f (x) = 3x, then the inverse is x = 3y or y=x/3