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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v = 11/7 // - 11/7
6/v-(11/7) = 0
6/v-11/7 = 0
6*v^-1 = 11/7 // : 6
v^-1 = 11/42
-1 < 0
1/(v^1) = 11/42 // * v^1
1 = 11/42*v^1 // : 11/42
42/11 = v^1
v = 42/11
v = 42/11
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