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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11/v = 8/5 // - 8/5
11/v-(8/5) = 0
11/v-8/5 = 0
11*v^-1 = 8/5 // : 11
v^-1 = 8/55
-1 < 0
1/(v^1) = 8/55 // * v^1
1 = 8/55*v^1 // : 8/55
55/8 = v^1
v = 55/8
v = 55/8
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