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v in (-oo:+oo)
v^2+(2/11)*v+1/121 = 0
v^2+2/11*v+1/121 = 0
DELTA = (2/11)^2-(1/121*1*4)
DELTA = 0
v = -2/11/(1*2)
v = -1/11 or v = -1/11
v in { -1/11, -1/11 }
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