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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/9)*x+27 = 7/x-(5/9)+3 // - 7/x-(5/9)+3
(9/9)*x-(7/x)+5/9-3+27 = 0
(9/9)*x-7*x^-1+5/9-3+27 = 0
1*x^1-7*x^-1+221/9*x^0 = 0
(1*x^2+221/9*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+221/9*x^1-7*x^0) = 0
x^1
x^2+(221/9)*x-7 = 0
x^2+(221/9)*x-7 = 0
DELTA = (221/9)^2-(-7*1*4)
DELTA = 51109/81
DELTA > 0
x = ((51109/81)^(1/2)-(221/9))/(1*2) or x = (-(221/9)-(51109/81)^(1/2))/(1*2)
x = ((51109/81)^(1/2)-221/9)/2 or x = (-((51109/81)^(1/2)+221/9))/2
x in { (-((51109/81)^(1/2)+221/9))/2, ((51109/81)^(1/2)-221/9)/2}
x in { (-((51109/81)^(1/2)+221/9))/2, ((51109/81)^(1/2)-221/9)/2 }
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