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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1152/v = 18 // - 18
1152/v-18 = 0
1152*v^-1 = 18 // : 1152
v^-1 = 1/64
-1 < 0
1/(v^1) = 1/64 // * v^1
1 = 1/64*v^1 // : 1/64
64 = v^1
v = 64
v = 64
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