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42 = 2(W+L)
21= (W+L)
L= 3+5W)
21= W +(3+5W)
21= 3+6W
21-3=6W
18=6W
W=18/6
=3
Answer:
w = PERIMETER/2 - LENGTH
w = 42/2 - (3+5w)
PS. I THINK THIS IS RIGHT. NOT TOO SURE, BUT MOST LIKELY.