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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
9/v = 2/4 // - 2/4
9/v-(2/4) = 0
9/v-1/2 = 0
9*v^-1 = 1/2 // : 9
v^-1 = 1/18
-1 < 0
1/(v^1) = 1/18 // * v^1
1 = 1/18*v^1 // : 1/18
18 = v^1
v = 18
v = 18
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