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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
78/v = 2 // - 2
78/v-2 = 0
78*v^-1 = 2 // : 78
v^-1 = 1/39
-1 < 0
1/(v^1) = 1/39 // * v^1
1 = 1/39*v^1 // : 1/39
39 = v^1
v = 39
v = 39
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