Subtracting what number from 30 gives 7?

To solve the problem of what number needs to be subtracted from 30 to yield 7, the equation can be set up as follows:

30 - x = 7

Here, x is the number that needs to be subtracted from 30. To find x, rearranging the equation gives:

x = 30 - 7

Calculating this:

x = 23

Thus, subtracting 23 from 30 results in 7. This aligns perfectly with the operation required, confirming that the correct answer represents the necessary subtraction to achieve the desired result.