Question

Solve each equation. Check your solution.

$18-(-f)=91$

Short answer

The required solution is $f=73$.

Step-by-step solution

Step 1. Write the given information.

The given equation is:

$18-(-f)=91$

Step 2. Calculation.

Consider the given equation,

$$\begin{gathered} 18-\left(-f\right)=91 \\ 18+f=91 \\ f=91-18 \\ f=73 \end{gathered}$$

Step 3. Checking solution.

Substitute $f=73$in the given equation to check:

role="math" localid="1642419044325" $$\begin{gathered} 18-\left(-f\right)=91 \\ 18-\left(-73\right)=91 \\ 18+73=91 \\ 91=91 \end{gathered}$$

Hence, proved.