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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8 = -2/v // + -2/v
8-(-2/v) = 0
2*v^-1+8 = 0
2*v^-1 = -8 // : 2
v^-1 = -4
-1 < 0
1/(v^1) = -4 // * v^1
1 = -4*v^1 // : -4
-1/4 = v^1
v = -1/4
v = -1/4
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