Question 1159197
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<pre>

W + L + W + L = 58,   or


2W + 2L = 58,         or

2*(W + L) = 58,       or

W + L = 58/2 = 29,    or

W + (W+13)   = 29,

2W           = 29-13 = 16

W                    = 16/2 = 8.


<U>ANSWER</U>.  W, or the width, is 8 inches.
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In more short form



<pre>
W + L = 58/2 = 29


W + (W + 13) = 29

2W           = 29-13 = 16

W                    = 16/2 = 8.
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Solved.