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ANSWER
[tex]w=\frac{1}{2}l-4[/tex]EXPLANATION
The width of the rectangle is 4 less than half the length.
Let the width be w.
Let the length be l.
Therefore, it means that to find the width, subtract 4 from half of the length.
That is:
[tex]w=\frac{1}{2}l-4[/tex]