The area of a rectangle is length + length + width + width, or 2l + 2w. Set these equal.
= + + width + width
= 7 + 2w; subtract 7 from both sides
= 2w; divide both sides by 2
= w, or the width (in meters)
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= 
+ + width + width = 7 + 2w; subtract 7 from both sides
= 2w; divide both sides by 2
= w, or the width (in meters)