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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
312/502 = 468/v // - 468/v
312/502-(468/v) = 0
312/502-468*v^-1 = 0
-468*v^-1 = -156/251 // : -468
v^-1 = 1/753
-1 < 0
1/(v^1) = 1/753 // * v^1
1 = 1/753*v^1 // : 1/753
753 = v^1
v = 753
v = 753
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