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v in (-oo:+oo)
v^2-((18/2)*v^2)-(3*v)-72 = 0
v^2-9*v^2-3*v-72 = 0
-8*v^2-3*v-72 = 0
DELTA = (-3)^2-(-72*(-8)*4)
DELTA = -2295
DELTA < 0
v belongs to the empty set
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