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v in (-oo:+oo)
(8/8)*v^2+10*v = 0
v^2+10*v = 0
DELTA = 10^2-(0*1*4)
DELTA = 100
DELTA > 0
v = (100^(1/2)-10)/(1*2) or v = (-100^(1/2)-10)/(1*2)
v = 0 or v = -10
v in { -10, 0 }
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