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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(14*v^2)/v-7 = 0
14*v-7 = 0 // + 7
14*v = 7 // : 14
v = 7/14
v = 1/2
v = 1/2
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