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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5*x = 10*x-(1/x) // - 10*x-(1/x)
5*x-(10*x)+1/x = 0
5*x-10*x+1/x = 0
1*x^-1-5*x^1 = 0
(1*x^0-5*x^2)/(x^1) = 0 // * x^2
x^1*(1*x^0-5*x^2) = 0
x^1
1-5*x^2 = 0
1-5*x^2 = 0
DELTA = 0^2-(-5*1*4)
DELTA = 20
DELTA > 0
x = (20^(1/2)+0)/(-5*2) or x = (0-20^(1/2))/(-5*2)
x = (-5^(1/2))/5 or x = (1*5^(1/2))/5
x in { (-5^(1/2))/5, (1*5^(1/2))/5}
x in { (-5^(1/2))/5, (1*5^(1/2))/5 }
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