Question

The sum of x and -15 is 23

Answer 1

38

Explanation:

23+15=38 because in order to get 23 from -15 a negative number you need to have 38 to silence the -15.

Answer 2

Answer: x=38

Explanation:

x+(-15)=23

x-15=23

+15 +15

x=38

When there is a positive and negative sign the negative sign cancels the positive sign.