Chapter 2 - Solving Equations - 2-3 Solving Multi-Step Equations - Practice and Problem-Solving Exercises - Page 98: 25

$f=52/7$

The quantity inside of the parenthesis is being multiplied by 7. Thus, we first divide by 7 to find that $f-1=45/7$. We need to get the f alone. Thus, we cancel out the subtraction by adding 1 on both sides to find that $f=52/7$.