The sum of two numbers is 72. the greater number is 8 more than the smaller number. which equation can be used to solve for the smaller number?

The answer would be 72=x+(x-8), where x is equal to the larger number.
This would be because the sum of 72 is equal to a number and 8 less than that number, which can be represented by x plus 8 less than x, or x+(x-8).

60 ÷ -20 x makes x = -3

The first digit is in the middle school 100s place