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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11/v = 5/17 // - 5/17
11/v-(5/17) = 0
11/v-5/17 = 0
11*v^-1 = 5/17 // : 11
v^-1 = 5/187
-1 < 0
1/(v^1) = 5/187 // * v^1
1 = 5/187*v^1 // : 5/187
187/5 = v^1
v = 187/5
v = 187/5
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