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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(2/x) = 7/9 // - 7/9
x-(2/x)-(7/9) = 0
x-2*x^-1-7/9 = 0
1*x^1-2*x^-1-7/9*x^0 = 0
(1*x^2-7/9*x^1-2*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-7/9*x^1-2*x^0) = 0
x^1
x^2+(-7/9)*x-2 = 0
x^2+(-7/9)*x-2 = 0
DELTA = (-7/9)^2-(-2*1*4)
DELTA = 697/81
DELTA > 0
x = ((697/81)^(1/2)-(-7/9))/(1*2) or x = (-(-7/9)-(697/81)^(1/2))/(1*2)
x = ((697/81)^(1/2)+7/9)/2 or x = (7/9-(697/81)^(1/2))/2
x in { (7/9-(697/81)^(1/2))/2, ((697/81)^(1/2)+7/9)/2}
x in { (7/9-(697/81)^(1/2))/2, ((697/81)^(1/2)+7/9)/2 }
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