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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v+1*v-(2/v)+2/v-1+4 = 0
v+v-2*v^-1+2/v-1+4 = 0
2*v+3 = 0 // - 3
2*v = -3 // : 2
v = -3/2
v = -3/2
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