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