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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-3+1 = x/2 // - x/2
10/x-(x/2)-3+1 = 0
10*x^-1-1/2*x^1-2*x^0 = 0
(10*x^0-1/2*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(10*x^0-1/2*x^2-2*x^1) = 0
x^1
(-1/2)*x^2-2*x+10 = 0
(-1/2)*x^2-2*x+10 = 0
DELTA = (-2)^2-(4*10*(-1/2))
DELTA = 24
DELTA > 0
x = (24^(1/2)+2)/(2*(-1/2)) or x = (2-24^(1/2))/(2*(-1/2))
x = -(2*6^(1/2)+2) or x = -(2-2*6^(1/2))
x in { -(2*6^(1/2)+2), -(2-2*6^(1/2))}
x in { -(2*6^(1/2)+2), -(2-2*6^(1/2)) }
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