[ Answer ]
[tex]\boxed{\bold{4}}[/tex]
[ Explanation ]
--------------------------------
[tex]\frac{\frac{5}{5} }{5}[/tex]([tex]5^{2}[/tex] - 5)
[tex]\frac{1}{5}[/tex]([tex]5^{2}[/tex] - 5)
[tex]\frac{1 \ * \ 5^{2 \ - \ 5} }{5}[/tex]
1 · ([tex]5^{2}[/tex] - 5) = 20
= [tex]\frac{20}{5}[/tex]
20 ÷ 5
= 4
[tex]\boxed{\bold{[] \ Eclipsed \ []}}[/tex]