Answer:
Step-by-step explanation:
x- one side
x-3- another side
Perimeter- 54
x+x-3+x+x-3=54
4x-9=54
+9 +9
________________-
4x= 63
÷4 ÷4
____________
x=15.75
So answers= 15.75 and 12.75
I don't know if its right so don't be mad i wrong!! But hope this helps and will give u hint how to do it so u can check :3