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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1/x-2 = 4/7 // - 4/7
x+1/x-(4/7)-2 = 0
x+1/x-4/7-2 = 0
1*x^1+1*x^-1-18/7*x^0 = 0
(1*x^2-18/7*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-18/7*x^1+1*x^0) = 0
x^1
x^2+(-18/7)*x+1 = 0
x^2+(-18/7)*x+1 = 0
DELTA = (-18/7)^2-(1*1*4)
DELTA = 128/49
DELTA > 0
x = ((128/49)^(1/2)-(-18/7))/(1*2) or x = (-(-18/7)-(128/49)^(1/2))/(1*2)
x = ((128/49)^(1/2)+18/7)/2 or x = (18/7-(128/49)^(1/2))/2
x in { (18/7-(128/49)^(1/2))/2, ((128/49)^(1/2)+18/7)/2}
x in { (18/7-(128/49)^(1/2))/2, ((128/49)^(1/2)+18/7)/2 }
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