Who is a genius to find the missing number in the following table?

The number to fill in is 10
In each column, subtract the second number from the top number and add the third number to get the number at the bottom.

7 - 5 + 4 = 6.

6 - 4 + 7 = 9.

5 - 1 + 3 = 7.

4 - 2 + 8 = 10.