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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3/13 = 11/v // - 11/v
3/13-(11/v) = 0
3/13-11*v^-1 = 0
-11*v^-1 = -3/13 // : -11
v^-1 = 3/143
-1 < 0
1/(v^1) = 3/143 // * v^1
1 = 3/143*v^1 // : 3/143
143/3 = v^1
v = 143/3
v = 143/3
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