Answer:
It seems like you want to find the solution for the equation f(x) = 9 - 6x. To solve for x, set the equation equal to zero and then solve for x:
9 - 6x = 0
-6x = -9
x = (-9) / (-6)
x = 3/2
So, the solution for the equation f(x) = 9 - 6x is x = 3/2.