Negative because it is going down
The perimeter of the square is given by:

Where,
x: square side.
Substituting values we have:

Rewriting the perimeter of the square we have:

Finally, dividing both values:

Answer:
the perimeter of the square is:

First, solve the parenthesis
Remember to follow PEMDAS, and the left-> right rule
12/3 = 4
4 x 2 = 8
8 + 3 = 11
11 - 7 = 4
Square the remaining number
4² = 4 x 4 = 16
16 is your answer
hope this helps