Answer
L$\approx$8.1
Work Step by Step
$\frac{5}{L}$=$\frac{L-5}{5}$
L$^2$-5L-25=0
L=$\frac{5+\sqrt {-5^2-4(-25)}}{2}$
L=$\frac{5+\sqrt {125}}{2}$
L$\approx$8.1
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