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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
11/v = 3/8 // - 3/8
11/v-(3/8) = 0
11/v-3/8 = 0
11*v^-1 = 3/8 // : 11
v^-1 = 3/88
-1 < 0
1/(v^1) = 3/88 // * v^1
1 = 3/88*v^1 // : 3/88
88/3 = v^1
v = 88/3
v = 88/3
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