'Y' is a function 'f' of 'x':
Y = f(x) .
'Z' is a function 'g' of 'y':
Z = g [ f(x) ] .
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Change f(x) to y and solve the problem.
f(x)= -x-9
f : x -> 3x + 2 where 0 < x <23.
To write f divided by 3 in algebraic notation, you would express it as f/3. This represents the division of the variable f by the constant 3. This notation is commonly used in algebra to represent division operations involving variables and constants.
If it were written in a book of some sort, fx or f(x) is read aloud as "f or x". "f" is a function of some variable, "x". By function it means something happens to x e.g. x2 or 3x+4.