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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
2/v = 8/v-(1/11) // - 8/v-(1/11)
2/v-(8/v)+1/11 = 0
2/v-8*v^-1+1/11 = 0
-6*v^-1 = -1/11 // : -6
v^-1 = 1/66
-1 < 0
1/(v^1) = 1/66 // * v^1
1 = 1/66*v^1 // : 1/66
66 = v^1
v = 66
v = 66
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