What is the inverse function of x➡️7x?

The inverse function is x ➡️ x/7

Let
y = f(x) = 7x and g (y) = x
g is inverse of f

7x = y
x = y/7
g (y) = y/7
g (x) = x/7___inverse function

To find the inverse function, first reverse it:
7x --> x

Now you want to only have x on the left side, so divide both sides by 7:
x --> x/7