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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8/v = 3/6 // - 3/6
8/v-(3/6) = 0
8/v-1/2 = 0
8*v^-1 = 1/2 // : 8
v^-1 = 1/16
-1 < 0
1/(v^1) = 1/16 // * v^1
1 = 1/16*v^1 // : 1/16
16 = v^1
v = 16
v = 16
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