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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
12/v = 11/3 // - 11/3
12/v-(11/3) = 0
12/v-11/3 = 0
12*v^-1 = 11/3 // : 12
v^-1 = 11/36
-1 < 0
1/(v^1) = 11/36 // * v^1
1 = 11/36*v^1 // : 11/36
36/11 = v^1
v = 36/11
v = 36/11
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