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