1. x = 8 -8 When the number that is the sum or answer, the number that is in the lines is usually the same but is the opposite, os if it is positive, then it is negative.
2. x = 7, -7
3. A = 6, -10 8 - 2 = 6 8 + 2 = 10 Switch it up, put the negative sign with the 10.
This is all that I can do right now I hope this helped I will try to answer more later.