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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
10/v = 13/3 // - 13/3
10/v-(13/3) = 0
10/v-13/3 = 0
10*v^-1 = 13/3 // : 10
v^-1 = 13/30
-1 < 0
1/(v^1) = 13/30 // * v^1
1 = 13/30*v^1 // : 13/30
30/13 = v^1
v = 30/13
v = 30/13
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