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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6 = 9/v // - 9/v
6-(9/v) = 0
6-9*v^-1 = 0
-9*v^-1 = -6 // : -9
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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