Step-by-step explanation:
The four sides of a square are equal.
7x + 3 = 5x + 8 Â Â Â Â Â Â Subtract 5x from both sides
7x - 5x + 3 = 8 Â Â Â Â Â Â Â Combine the left
2x + 3 = 8 Â Â Â Â Â Â Â Â Â Â Subtract 3 from both sides
2x = 8-3 Â Â Â Â Â Â Â Â Â Â Â Â Combine the right
2x = 5 Â Â Â Â Â Â Â Â Â Â Â Â Â Divide by 2
x = 5/2
x = 2.5
That is not quite the answer
Side = 7x + 3
Side = 7*2.5 + 3
Side = 17.5 + 3
Side = 20.5