Answer:
B; x = 8
Explanation:
I think I understand what the picture is saying. So,
On the left hand side, the x's and +1's represent the following expression:
.
On the right hand side, the x's and -1's represent the following expression:
.
Put these two together and you get the following equation:
=

First, Solve for x:
8 = x
So, when solving the equation, x is equal to 8