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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x = x+3/x+5/x-4-4 // - x+3/x+5/x-4-4
2*x-x-(3/x)-(5/x)+4+4 = 0
2*x-x-3*x^-1-5*x^-1+4+4 = 0
1*x^1-8*x^-1+8*x^0 = 0
(1*x^2+8*x^1-8*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+8*x^1-8*x^0) = 0
x^1
x^2+8*x-8 = 0
x^2+8*x-8 = 0
DELTA = 8^2-(-8*1*4)
DELTA = 96
DELTA > 0
x = (96^(1/2)-8)/(1*2) or x = (-96^(1/2)-8)/(1*2)
x = (4*6^(1/2)-8)/2 or x = (-4*6^(1/2)-8)/2
x in { (-4*6^(1/2)-8)/2, (4*6^(1/2)-8)/2}
x in { (-4*6^(1/2)-8)/2, (4*6^(1/2)-8)/2 }
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