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D( x )
(x/5)*x-25 = 0
x^2 = 0
(x/5)*x-25 = 0
(x/5)*x-25 = 0
1/5*x^2 = 25 // : 1/5
x^2 = 125
x^2 = 125 // ^ 1/2
abs(x) = 5*5^(1/2)
x = 5*5^(1/2) or x = -(5*5^(1/2))
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:-(5*5^(1/2))) U (-(5*5^(1/2)):0) U (0:5*5^(1/2)) U (5*5^(1/2):+oo)
(5/(x^2)-(5*x))/((x/5)*x-25) = 0
(5/(x^2)-5*x)/((x/5)*x-25) = 0
(5*x^-2-5*x)/(1/5*x^2-25) = 0
5*x^-2-5*x = 0
5*x*(x^-3-1) = 0
1*x^-3 = 1 // : 1
x^-3 = 1
-3 < 0
1/(x^3) = 1 // * x^3
1 = 1*x^3 // : 1
1 = x^3
x^3 = 1 // ^ 1/3
x = 1
5*x*(x-1) = 0
(5*x*(x-1))/(1/5*x^2-25) = 0
( 5*x )
5*x = 0 // : 5
x = 0
( x-1 )
x-1 = 0 // + 1
x = 1
x in { 0}
x = 1
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