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