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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2-2)/x-5 = (2*x-2)/x // - (2*x-2)/x
(x^2-2)/x-((2*x-2)/x)-5 = 0
(x^2-2)/x+(-1*(2*x-2))/x-5 = 0
(x^2-2)/x+(-1*(2*x-2))/x+(-5*x)/x = 0
x^2-1*(2*x-2)-5*x-2 = 0
x^2-2*x-5*x = 0
x^2-7*x = 0
x^2-7*x = 0
x*(x-7) = 0
x-7 = 0 // + 7
x = 7
x*(x-7) = 0
(x*(x-7))/x = 0
(x*(x-7))/x = 0 // * x
x*(x-7) = 0
( x-7 )
x-7 = 0 // + 7
x = 7
( x )
x = 0
x in { 0}
x = 7
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