Explanation

We are given the equation:

$$7 - m = 12 - n$$

To find$n-m$, solve the equation step-by-step:

Step 1: Rearrange the equation

$$7 - m = 12 - n Rightarrow -m + n = 12 - 7 Rightarrow -m + n = 5 Rightarrow n - m = 5$$