Hello!
Question 7
x + 8 = -2
x + 8 - 8 = -2 - 8 (subtract 8 from both sides to remove +8 from x)
x = - 10
Choice A.
Question 8
x - 7 = -3
x - 7 + 7 = -3 + 7 (add 7 to both sides to remove -7 from x)
x = 4
Choice A.
Question 9
36½ - 24½ = 12
Choice B.
Question 10
29 - x = 17 ¼
The reason the value of the number reduces is because a number, x, is subtracted from the original value.
So when subtracting by a number, let's say variable x, the result is naturally a smaller number. (unless the variable is negative)
Choice B.
