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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/v-5 = 9/2 // - 9/2
6/v-(9/2)-5 = 0
6/v-9/2-5 = 0
6*v^-1 = 19/2 // : 6
v^-1 = 19/12
-1 < 0
1/(v^1) = 19/12 // * v^1
1 = 19/12*v^1 // : 19/12
12/19 = v^1
v = 12/19
v = 12/19
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