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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v+1/3 = (7/3)*v // - (7/3)*v
6/v-((7/3)*v)+1/3 = 0
(-7/3)*v+6/v+1/3 = 0
6*v^-1-7/3*v^1+1/3*v^0 = 0
(1/3*v^1-7/3*v^2+6*v^0)/(v^1) = 0 // * v^2
v^1*(1/3*v^1-7/3*v^2+6*v^0) = 0
v^1
(-7/3)*v^2+(1/3)*v+6 = 0
(-7/3)*v^2+(1/3)*v+6 = 0
DELTA = (1/3)^2-(4*6*(-7/3))
DELTA = 505/9
DELTA > 0
v = ((505/9)^(1/2)-(1/3))/(2*(-7/3)) or v = (-(1/3)-(505/9)^(1/2))/(2*(-7/3))
v = -3/14*((505/9)^(1/2)-1/3) or v = 3/14*((505/9)^(1/2)+1/3)
v in { -3/14*((505/9)^(1/2)-1/3), 3/14*((505/9)^(1/2)+1/3)}
v in { -3/14*((505/9)^(1/2)-1/3), 3/14*((505/9)^(1/2)+1/3) }
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