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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
56/v = 6 // - 6
56/v-6 = 0
56*v^-1 = 6 // : 56
v^-1 = 3/28
-1 < 0
1/(v^1) = 3/28 // * v^1
1 = 3/28*v^1 // : 3/28
28/3 = v^1
v = 28/3
v = 28/3
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