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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
3 = 7/v+6 // - 7/v+6
3-(7/v)-6 = 0
3-7*v^-1-6 = 0
-7*v^-1 = 3 // : -7
v^-1 = -3/7
-1 < 0
1/(v^1) = -3/7 // * v^1
1 = -3/7*v^1 // : -3/7
-7/3 = v^1
v = -7/3
v = -7/3
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