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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
12/v = -3 // + 3
12/v+3 = 0
12*v^-1 = -3 // : 12
v^-1 = -1/4
-1 < 0
1/(v^1) = -1/4 // * v^1
1 = -1/4*v^1 // : -1/4
-4 = v^1
v = -4
v = -4
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