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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
32 = 8/v // - 8/v
32-(8/v) = 0
32-8*v^-1 = 0
-8*v^-1 = -32 // : -8
v^-1 = 4
-1 < 0
1/(v^1) = 4 // * v^1
1 = 4*v^1 // : 4
1/4 = v^1
v = 1/4
v = 1/4
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