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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/v-12 = 15 // - 15
3/v-15-12 = 0
3*v^-1 = 27 // : 3
v^-1 = 9
-1 < 0
1/(v^1) = 9 // * v^1
1 = 9*v^1 // : 9
1/9 = v^1
v = 1/9
v = 1/9
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