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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-4/v = 8 // - 8
-4/v-8 = 0
-4*v^-1 = 8 // : -4
v^-1 = -2
-1 < 0
1/(v^1) = -2 // * v^1
1 = -2*v^1 // : -2
-1/2 = v^1
v = -1/2
v = -1/2
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