Find All Real Values Of $x$ Such That $f ( x ) = 0$

Multiple Choice

Find all real values of $x$ such that $f ( x ) = 0$ .
$f ( x ) = \frac { 7 x - 5 } { 7 }$

A) $\frac { 5 } { 49 }$

B) $\pm \frac { 5 } { 49 }$

C) $\pm \frac { 5 } { 7 }$

D) $\frac { 5 } { 7 }$

E) $- \frac { 5 } { 7 }$