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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/5-x-(1/x)+6 = 0
5/5-x-x^-1+6 = 0
7*x^0-1*x^1-1*x^-1 = 0
(7*x^1-1*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(7*x^1-1*x^2-1*x^0) = 0
x^1
7*x-x^2-1 = 0
7*x-x^2-1 = 0
DELTA = 7^2-(-1*(-1)*4)
DELTA = 45
DELTA > 0
x = (45^(1/2)-7)/(-1*2) or x = (-45^(1/2)-7)/(-1*2)
x = (3*5^(1/2)-7)/(-2) or x = (-3*5^(1/2)-7)/(-2)
x in { (3*5^(1/2)-7)/(-2), (-3*5^(1/2)-7)/(-2)}
x in { (3*5^(1/2)-7)/(-2), (-3*5^(1/2)-7)/(-2) }
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