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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(6/x)+2 = 5/6 // - 5/6
x-(6/x)-(5/6)+2 = 0
x-6*x^-1-5/6+2 = 0
1*x^1-6*x^-1+7/6*x^0 = 0
(1*x^2+7/6*x^1-6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+7/6*x^1-6*x^0) = 0
x^1
x^2+(7/6)*x-6 = 0
x^2+(7/6)*x-6 = 0
DELTA = (7/6)^2-(-6*1*4)
DELTA = 913/36
DELTA > 0
x = ((913/36)^(1/2)-(7/6))/(1*2) or x = (-(7/6)-(913/36)^(1/2))/(1*2)
x = ((913/36)^(1/2)-7/6)/2 or x = (-((913/36)^(1/2)+7/6))/2
x in { (-((913/36)^(1/2)+7/6))/2, ((913/36)^(1/2)-7/6)/2}
x in { (-((913/36)^(1/2)+7/6))/2, ((913/36)^(1/2)-7/6)/2 }
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