w reduced by 22 means that 22 will be subtracted from every w - value.
So, to every w-value corresponds a value equal to w - 22.
Using the notation of functions, w is the independent variable or input and f(w) is the function that returns the dependent value or output:
inpunt otuput
w f(w) = w - 22
Answer: f(w) = w - 22