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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(128/x) = 0
2*x-128*x^-1 = 0
2*x^1-128*x^-1 = 0
(2*x^2-128*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-128*x^0) = 0
x^1
2*x^2-128 = 0
2*x^2-128 = 0
DELTA = 0^2-(-128*2*4)
DELTA = 1024
DELTA > 0
x = (1024^(1/2)+0)/(2*2) or x = (0-1024^(1/2))/(2*2)
x = 8 or x = -8
x in { -8, 8}
x in { -8, 8 }
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