Answer:106.
Step-by-step explanation:
The perimeter of each is the sum of the lengths of its sides.
Triangle Perimeter = 16 + 4x-3 +3x = 7x+13
Square Perimeter = 2x +2x +2x +2x = 8x
If these are equal, you have

The length of a side of the square is 26 units.
It’s (x-6)(x+4) so the first one and last one
X=11
All you have to do is add 5 to both sides and then divide by 5 on both sides