Question 128623
In a rectangle, the following equation relates the perimeter, length, and width:
Perimeter = 2*(length) + 2*(width).
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In this rectangle,
Perimeter = 54
Width = w
Length = w + 5 
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By substituting, we have 54 = 2*(w+5) + 2*(w).

See if you can solve that equation for w.