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D( v )
v-3 = 0
v-3 = 0
v-3 = 0
v-3 = 0 // + 3
v = 3
v in (-oo:3) U (3:+oo)
(2*v)/(v-3) < 0
( 2*v )
2*v+0 < 0 // - 0
2*v < 0 // : 2
v < 0/2
v < 0
( v-3 )
v-3 < 0 // + 3
v < 3
(-oo:0) (0:3) (3:+oo) 2*v - + + v-3 - - +
v in (0:3)
(0:3)
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