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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/y-(4*y)-((4/3)*y) = 6 // - 6
6/y-(4*y)-((4/3)*y)-6 = 0
(-4/3)*y-4*y+6/y-6 = 0
6*y^-1-16/3*y^1-6*y^0 = 0
(6*y^0-16/3*y^2-6*y^1)/(y^1) = 0 // * y^2
y^1*(6*y^0-16/3*y^2-6*y^1) = 0
y^1
(-16/3)*y^2-6*y+6 = 0
(-16/3)*y^2-6*y+6 = 0
DELTA = (-6)^2-(4*6*(-16/3))
DELTA = 164
DELTA > 0
y = (164^(1/2)+6)/(2*(-16/3)) or y = (6-164^(1/2))/(2*(-16/3))
y = -3/32*(2*41^(1/2)+6) or y = -3/32*(6-2*41^(1/2))
y in { -3/32*(2*41^(1/2)+6), -3/32*(6-2*41^(1/2))}
y in { -3/32*(2*41^(1/2)+6), -3/32*(6-2*41^(1/2)) }
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