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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8 = 5/v-3 // - 5/v-3
3-(5/v)+8 = 0
3-5*v^-1+8 = 0
-5*v^-1 = -11 // : -5
v^-1 = 11/5
-1 < 0
1/(v^1) = 11/5 // * v^1
1 = 11/5*v^1 // : 11/5
5/11 = v^1
v = 5/11
v = 5/11
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