It's a lot to take in, isn't it ? I started off by confirming the formula a=lb
a=lb
65= (x×2)-3×x
l=(x×2)-3
b=x
a=65
Now I tried plugging in random values. Eventually I came up with this ;
65= (6.5×2)-3×6.5
65= 13-3×6.5
65 = 10×6.5
65=65
Length = 10feet
Width = 6.5feet