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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-(5/v-8) = 2 // - 2
8-(5/v)-2 = 0
8-5*v^-1-2 = 0
-5*v^-1 = -6 // : -5
v^-1 = 6/5
-1 < 0
1/(v^1) = 6/5 // * v^1
1 = 6/5*v^1 // : 6/5
5/6 = v^1
v = 5/6
v = 5/6
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