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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
12/v = 5/11 // - 5/11
12/v-(5/11) = 0
12/v-5/11 = 0
12*v^-1 = 5/11 // : 12
v^-1 = 5/132
-1 < 0
1/(v^1) = 5/132 // * v^1
1 = 5/132*v^1 // : 5/132
132/5 = v^1
v = 132/5
v = 132/5
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