Answer:
x - 7/9 = f(x)^-1
Step-by-step explanation:
f(x) = 9x + 7
y - 7 = 9x
y - 7/9 = 9x/9
Interchange!
x - 7/9 = y
1/7 is your answer. It can't be reduced any further. If there is supposed to be a problem, next time, add it.
You've completed 11/12 of your project
Only 1/12 left to go!
2/3 + 1/4 = 11/12
