Given Functions F and G, Perform the Indicated Operations $( f - g ) ( x )$

Multiple Choice

Given functions f and g, perform the indicated operations.
-Find the domain of $( f - g ) ( x )$ when $f ( x ) = 3 x - 7$ and $g ( x ) = 8 x - 8$ .

A) Domain: $( - \infty , \infty )$
B) Domain: $( - 7,3 )$
C) Domain: $( - 3,7 )$
D) Domain: $( - 7 , \infty )$