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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
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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