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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
8 = 6/v-2 // - 6/v-2
2-(6/v)+8 = 0
2-6*v^-1+8 = 0
-6*v^-1 = -10 // : -6
v^-1 = 5/3
-1 < 0
1/(v^1) = 5/3 // * v^1
1 = 5/3*v^1 // : 5/3
3/5 = v^1
v = 3/5
v = 3/5
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