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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
9/v = 8/13 // - 8/13
9/v-(8/13) = 0
9/v-8/13 = 0
9*v^-1 = 8/13 // : 9
v^-1 = 8/117
-1 < 0
1/(v^1) = 8/117 // * v^1
1 = 8/117*v^1 // : 8/117
117/8 = v^1
v = 117/8
v = 117/8
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