Find the Value of K That Makes the Antidifferentiation Formula $\int x ^ { - 7 } d x$

Multiple Choice

Find the value of k that makes the antidifferentiation formula true.
- $\int x ^ { - 7 } d x$ = k $x ^ { - 6 }$ + C

A) 6
B) -6
C) $\frac { 1 } { 6 }$
D) - $\frac { 1 } { 6 }$