Solve for x in the equation x + 7 = 10.

To solve the equation x + 7 = 10, the goal is to isolate the variable x. This is accomplished by performing the same operation on both sides of the equation. In this case, we want to eliminate the 7 that is being added to x.

To do this, subtract 7 from both sides of the equation:

x + 7 - 7 = 10 - 7

This simplifies to:

x = 3

Thus, the value of x that satisfies the equation x + 7 = 10 is 3, confirming that the correct answer is indeed the one that specifies x = 3.