F\left( x \right) = 3x + 6f(x)=3x+6. Find the inverse of f(x). A.{f^{ - 1}}\left( x \right) = 6 - 3xf −1 (x)=6−3x
B.{f^{ - 1}}\left( x \right) = \frac{{x - 3}}{6}f −1 (x)= 6x−3
C.{f^{ - 1}}\left( x \right) = \frac{{x - 6}}{3}f −1 (x)= 3x−6
D.{f^{ - 1}}\left( x \right) = 3x - 6f −1x)=3x−6
it c