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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5-6/v = (5/2)*v+1+10 // - (5/2)*v+1+10
5-((5/2)*v)-6/v-10-1 = 0
(-5/2)*v-6/v-10-1+5 = 0
-5/2*v^1-6*v^-1-6*v^0 = 0
(-5/2*v^2-6*v^1-6*v^0)/(v^1) = 0 // * v^2
v^1*(-5/2*v^2-6*v^1-6*v^0) = 0
v^1
(-5/2)*v^2-6*v-6 = 0
(-5/2)*v^2-6*v-6 = 0
DELTA = (-6)^2-(-6*4*(-5/2))
DELTA = -24
DELTA < 0
v in { }
v belongs to the empty set
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