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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
45/v = 9 // - 9
45/v-9 = 0
45*v^-1 = 9 // : 45
v^-1 = 1/5
-1 < 0
1/(v^1) = 1/5 // * v^1
1 = 1/5*v^1 // : 1/5
5 = v^1
v = 5
v = 5
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