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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2*y+(1/3)*y-(5/y)-18+6 = 1/3 // - 1/3
2*y+(1/3)*y-(5/y)-(1/3)-18+6 = 0
2*y+(1/3)*y-5*y^-1-1/3-18+6 = 0
7/3*y^1-5*y^-1-37/3*y^0 = 0
(7/3*y^2-37/3*y^1-5*y^0)/(y^1) = 0 // * y^2
y^1*(7/3*y^2-37/3*y^1-5*y^0) = 0
y^1
(7/3)*y^2+(-37/3)*y-5 = 0
(7/3)*y^2+(-37/3)*y-5 = 0
DELTA = (-37/3)^2-(-5*4*(7/3))
DELTA = 1789/9
DELTA > 0
y = ((1789/9)^(1/2)-(-37/3))/(2*(7/3)) or y = (-(-37/3)-(1789/9)^(1/2))/(2*(7/3))
y = 3/14*((1789/9)^(1/2)+37/3) or y = 3/14*(37/3-(1789/9)^(1/2))
y in { 3/14*(37/3-(1789/9)^(1/2)), 3/14*((1789/9)^(1/2)+37/3)}
y in { 3/14*(37/3-(1789/9)^(1/2)), 3/14*((1789/9)^(1/2)+37/3) }
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