I need help solving this problem:

fis a function that takes a real number x and performs these three steps in the order given:

(1) Take theabsolute value.

(2) Subtract 7.

(3) Take the reciprocal of the result.

(That is, make the quantity the denominator of a fraction with numerator 1.)

(a) Find an expression for f (x).(no explanation required)

(b) State the domain of f.(no explanation required)