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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
10/v = 3/13 // - 3/13
10/v-(3/13) = 0
10/v-3/13 = 0
10*v^-1 = 3/13 // : 10
v^-1 = 3/130
-1 < 0
1/(v^1) = 3/130 // * v^1
1 = 3/130*v^1 // : 3/130
130/3 = v^1
v = 130/3
v = 130/3
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