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