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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(7/x) = 2/9 // - 2/9
x-(7/x)-(2/9) = 0
x-7*x^-1-2/9 = 0
1*x^1-7*x^-1-2/9*x^0 = 0
(1*x^2-2/9*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-2/9*x^1-7*x^0) = 0
x^1
x^2+(-2/9)*x-7 = 0
x^2+(-2/9)*x-7 = 0
DELTA = (-2/9)^2-(-7*1*4)
DELTA = 2272/81
DELTA > 0
x = ((2272/81)^(1/2)-(-2/9))/(1*2) or x = (-(-2/9)-(2272/81)^(1/2))/(1*2)
x = ((2272/81)^(1/2)+2/9)/2 or x = (2/9-(2272/81)^(1/2))/2
x in { (2/9-(2272/81)^(1/2))/2, ((2272/81)^(1/2)+2/9)/2}
x in { (2/9-(2272/81)^(1/2))/2, ((2272/81)^(1/2)+2/9)/2 }
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