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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
4 = -6/v // + -6/v
4-(-6/v) = 0
6*v^-1+4 = 0
6*v^-1 = -4 // : 6
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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