What is the result of subtracting 3 from 7?

To find the result of subtracting 3 from 7, you perform the mathematical operation of subtraction where you take the second number away from the first number. This can be expressed as:

7 - 3 = 4

Performing this calculation shows that when you remove 3 units from 7 units, you are left with 4 units. Hence, the correct answer is 4. This fundamental arithmetic illustrates how basic operations function and can be applied in various mathematical contexts, reinforcing the understanding of subtraction as taking away or finding the difference between two numbers.