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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-8/v = 6 // - 6
-8/v-6 = 0
-8*v^-1 = 6 // : -8
v^-1 = -3/4
-1 < 0
1/(v^1) = -3/4 // * v^1
1 = -3/4*v^1 // : -3/4
-4/3 = v^1
v = -4/3
v = -4/3
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