Suppose $\displaystyle f(x) = \frac{7}{3 - x^3}$.

(a) Calculate exactly the value of $y$ when $y = f(2)$. Simplify your answer as much as possible. Enter a fraction instead of a decimal.
$y =$ help (fractions)

(b) Calculate exactly the value of $x$ when $f(x) = 7$. Simplify your answer as much as possible.
$x =$ help (numbers)