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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+x+8/x-1 = 9/x-1 // - 9/x-1
x+x+8/x-(9/x)-1+1 = 0
x+x+8/x-9*x^-1-1+1 = 0
2*x^1-1*x^-1 = 0
(2*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-1*x^0) = 0
x^1
2*x^2-1 = 0
2*x^2-1 = 0
DELTA = 0^2-(-1*2*4)
DELTA = 8
DELTA > 0
x = (8^(1/2)+0)/(2*2) or x = (0-8^(1/2))/(2*2)
x = (2^(1/2))/2 or x = (-2^(1/2))/2
x in { (-2^(1/2))/2, (2^(1/2))/2}
x in { (-2^(1/2))/2, (2^(1/2))/2 }
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