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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2/v = 9 // - 9
2/v-9 = 0
2*v^-1 = 9 // : 2
v^-1 = 9/2
-1 < 0
1/(v^1) = 9/2 // * v^1
1 = 9/2*v^1 // : 9/2
2/9 = v^1
v = 2/9
v = 2/9
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