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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-3/v = -9 // + 9
9-3/v = 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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