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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
234/v = 13 // - 13
234/v-13 = 0
234*v^-1 = 13 // : 234
v^-1 = 1/18
-1 < 0
1/(v^1) = 1/18 // * v^1
1 = 1/18*v^1 // : 1/18
18 = v^1
v = 18
v = 18
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