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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/5-x+10/x-5 = 0
10*x^-1-3/5*x^1-5*x^0 = 0
(10*x^0-3/5*x^2-5*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-3/5*x^2-5*x^1) = 0
x^1
(-3/5)*x^2-5*x+10 = 0
(-3/5)*x^2-5*x+10 = 0
DELTA = (-5)^2-(4*10*(-3/5))
DELTA = 49
DELTA > 0
x = (49^(1/2)+5)/(2*(-3/5)) or x = (5-49^(1/2))/(2*(-3/5))
x = -10 or x = 5/3
x in { -10, 5/3}
x in { -10, 5/3 }
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