Final answer:
To find the value of p, subtract 7.9 from 12.4 and multiply the result by -1.
Step-by-step explanation:
To find the value of p, you need to isolate it on one side of the equation. Start by subtracting 7.9 from both sides of the equation:
12.4 - p = 7.9
Subtracting 7.9 from 12.4 gives:
-p = -4.5
Finally, multiply both sides of the equation by -1 to solve for p:
p = 4.5