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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1/v-4 = 6 // - 6
1/v-6-4 = 0
1*v^-1 = 10 // : 1
v^-1 = 10
-1 < 0
1/(v^1) = 10 // * v^1
1 = 10*v^1 // : 10
1/10 = v^1
v = 1/10
v = 1/10
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