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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v = 4 // - 4
6/v-4 = 0
6*v^-1 = 4 // : 6
v^-1 = 2/3
-1 < 0
1/(v^1) = 2/3 // * v^1
1 = 2/3*v^1 // : 2/3
3/2 = v^1
v = 3/2
v = 3/2
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