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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)-6 = 7/6-x // - 7/6-x
x+x-(5/x)-(7/6)-6 = 0
x+x-5*x^-1-7/6-6 = 0
2*x^1-5*x^-1-43/6*x^0 = 0
(2*x^2-43/6*x^1-5*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-43/6*x^1-5*x^0) = 0
x^1
2*x^2+(-43/6)*x-5 = 0
2*x^2+(-43/6)*x-5 = 0
DELTA = (-43/6)^2-(-5*2*4)
DELTA = 3289/36
DELTA > 0
x = ((3289/36)^(1/2)-(-43/6))/(2*2) or x = (-(-43/6)-(3289/36)^(1/2))/(2*2)
x = ((3289/36)^(1/2)+43/6)/4 or x = (43/6-(3289/36)^(1/2))/4
x in { (43/6-(3289/36)^(1/2))/4, ((3289/36)^(1/2)+43/6)/4}
x in { (43/6-(3289/36)^(1/2))/4, ((3289/36)^(1/2)+43/6)/4 }
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