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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
(2*q)/3-(q/6)+5/q = (5*q)/6-(2/18) // - (5*q)/6-(2/18)
(2*q)/3-(q/6)-((5*q)/6)+5/q+2/18 = 0
(2*q)/3-(q/6)+(-5/6)*q+5/q+2/18 = 0
5*q^-1-1/3*q^1+1/9*q^0 = 0
(1/9*q^1-1/3*q^2+5*q^0)/(q^1) = 0 // * q^2
q^1*(1/9*q^1-1/3*q^2+5*q^0) = 0
q^1
(-1/3)*q^2+(1/9)*q+5 = 0
(-1/3)*q^2+(1/9)*q+5 = 0
DELTA = (1/9)^2-(4*5*(-1/3))
DELTA = 541/81
DELTA > 0
q = ((541/81)^(1/2)-(1/9))/(2*(-1/3)) or q = (-(1/9)-(541/81)^(1/2))/(2*(-1/3))
q = -3/2*((541/81)^(1/2)-1/9) or q = 3/2*((541/81)^(1/2)+1/9)
q in { -3/2*((541/81)^(1/2)-1/9), 3/2*((541/81)^(1/2)+1/9)}
q in { -3/2*((541/81)^(1/2)-1/9), 3/2*((541/81)^(1/2)+1/9) }
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