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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
1/v+1+6 = 2/v+2 // - 2/v+2
1/v-(2/v)-2+1+6 = 0
1/v-2*v^-1-2+1+6 = 0
-1*v^-1 = -5 // : -1
v^-1 = 5
-1 < 0
1/(v^1) = 5 // * v^1
1 = 5*v^1 // : 5
1/5 = v^1
v = 1/5
v = 1/5
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