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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2/v-16 = 8 // - 8
2/v-16-8 = 0
2*v^-1 = 24 // : 2
v^-1 = 12
-1 < 0
1/(v^1) = 12 // * v^1
1 = 12*v^1 // : 12
1/12 = v^1
v = 1/12
v = 1/12
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