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