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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6 = 7/v+5 // - 7/v+5
6-(7/v)-5 = 0
6-7*v^-1-5 = 0
-7*v^-1 = -1 // : -7
v^-1 = 1/7
-1 < 0
1/(v^1) = 1/7 // * v^1
1 = 1/7*v^1 // : 1/7
7 = v^1
v = 7
v = 7
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