To solve the equation:

\[
18 - (-f) = 91
\]

### Step-by-step solution:

1. Simplify the left side by noting that subtracting a negative is the same as adding:
   \[
   18 + f = 91
   \]

2. Subtract 18 from both sides to isolate \( f \):
   \[
   f = 91 - 18
   \]

3. Simplify the right-hand side:
   \[
   f = 73
   \]

Thus, the solution is \( f = 73 \).

Would you like more details, or do you have any questions?

### Related questions:
1. How would you solve the equation \( 18 - (-2f) = 91 \)?
2. What happens if you change the equation to \( 18 + (-f) = 91 \)?
3. How do you solve \( 18 - f = 91 \)?
4. How can you check the solution of \( f = 73 \) by plugging it back into the equation?
5. How does the process differ if you had \( 18 - (-f) = -91 \)?

### Tip:
When dealing with negative signs, remember that subtracting a negative number is the same as adding that number.

Learn how to solve the linear equation 18 - (-f) = 91 with a clear step-by-step solution. This problem explores key algebraic concepts like handling negative numbers and equation manipulation, suitable for students in Grades 6-8.

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