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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/4 = 9/v // - 9/v
3/4-(9/v) = 0
3/4-9*v^-1 = 0
-9*v^-1 = -3/4 // : -9
v^-1 = 1/12
-1 < 0
1/(v^1) = 1/12 // * v^1
1 = 1/12*v^1 // : 1/12
12 = v^1
v = 12
v = 12
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