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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/v = 12/32 // - 12/32
3/v-(12/32) = 0
3/v-3/8 = 0
3*v^-1 = 3/8 // : 3
v^-1 = 1/8
-1 < 0
1/(v^1) = 1/8 // * v^1
1 = 1/8*v^1 // : 1/8
8 = v^1
v = 8
v = 8
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