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