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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x-5)^2-25)/x = 0
(x-5)^2-25 = 0
(x-5)^2-25 = 0
x^2-10*x = 0
x^2-10*x = 0
x*(x-10) = 0
x-10 = 0 // + 10
x = 10
x*(x-10) = 0
x*(x-10) = 0
(x*(x-10))/x = 0
( x-10 )
x-10 = 0 // + 10
x = 10
( x )
x = 0
x in { 0}
x = 10
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