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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
13/v = 5/8 // - 5/8
13/v-(5/8) = 0
13/v-5/8 = 0
13*v^-1 = 5/8 // : 13
v^-1 = 5/104
-1 < 0
1/(v^1) = 5/104 // * v^1
1 = 5/104*v^1 // : 5/104
104/5 = v^1
v = 104/5
v = 104/5
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