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