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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+5/x-7 = x-(1/x)-4-1 // - x-(1/x)-4-1
X-x+5/x+1/x-7+1+4 = 0
6*x^-1-1*x^1-2*x^0 = 0
(6*x^0-1*x^2-2*x^1)/(x^1) = 0 // * x^2
x^1*(6*x^0-1*x^2-2*x^1) = 0
x^1
6-x^2-2*x = 0
6-x^2-2*x = 0
DELTA = (-2)^2-(-1*4*6)
DELTA = 28
DELTA > 0
x = (28^(1/2)+2)/(-1*2) or x = (2-28^(1/2))/(-1*2)
x = (2*7^(1/2)+2)/(-2) or x = (2-2*7^(1/2))/(-2)
x in { (2*7^(1/2)+2)/(-2), (2-2*7^(1/2))/(-2)}
x in { (2*7^(1/2)+2)/(-2), (2-2*7^(1/2))/(-2) }
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