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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/v = -9 // + 9
3/v+9 = 0
3*v^-1 = -9 // : 3
v^-1 = -3
-1 < 0
1/(v^1) = -3 // * v^1
1 = -3*v^1 // : -3
-1/3 = v^1
v = -1/3
v = -1/3
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