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