All the angles and sides are equal.
Which one will we start with? I'll explain 21. multiply it out and the clean it up. you should end up with 140=A if I'm correct.
I believe it is 4 to make it able to divide by both sides
Those are the answers
2x-2
6x+9
7x+35
10x-5y
There the same thing they both weigh the same thing hope it helps and have a great day!