Question

Perform the requested operation or operations.

Answer 1

$f(x) = \frac{x-3}{5}$
$g(x) = 5x+3$
$g(f(x)) = 5(\frac{x-3}{5})+3 = x-3+3 = x$

EDIT:
$f(g(x))=\frac{(5x+3)-3}{5}=\frac{5x+0}{5}=\frac{5x}{5}=x$