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v in (-oo:+oo)
v^2-((4/3)*v^2)-(3*v)+15*v+12 = 0
v^2+(-4/3)*v^2-3*v+15*v+12 = 0
12*v-1/3*v^2+12 = 0
DELTA = 12^2-(-1/3*4*12)
DELTA = 160
DELTA > 0
v = (160^(1/2)-12)/(-1/3*2) or v = (-160^(1/2)-12)/(-1/3*2)
v = -3/2*(4*10^(1/2)-12) or v = -3/2*(-4*10^(1/2)-12)
v in { -3/2*(4*10^(1/2)-12), -3/2*(-4*10^(1/2)-12) }
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