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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(1/x) = 35/6 // - 35/6
x-(1/x)-(35/6) = 0
x-x^-1-35/6 = 0
1*x^1-1*x^-1-35/6*x^0 = 0
(1*x^2-35/6*x^1-1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-35/6*x^1-1*x^0) = 0
x^1
x^2+(-35/6)*x-1 = 0
x^2+(-35/6)*x-1 = 0
DELTA = (-35/6)^2-(-1*1*4)
DELTA = 1369/36
DELTA > 0
x = ((1369/36)^(1/2)-(-35/6))/(1*2) or x = (-(-35/6)-(1369/36)^(1/2))/(1*2)
x = 6 or x = -1/6
x in { -1/6, 6}
x in { -1/6, 6 }
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