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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
6/5 = 12/v+7 // - 12/v+7
6/5-(12/v)-7 = 0
6/5-12*v^-1-7 = 0
-12*v^-1 = 29/5 // : -12
v^-1 = -29/60
-1 < 0
1/(v^1) = -29/60 // * v^1
1 = -29/60*v^1 // : -29/60
-60/29 = v^1
v = -60/29
v = -60/29
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