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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
-7/v-6 = 3/6 // - 3/6
-7/v-(3/6)-6 = 0
-7/v-1/2-6 = 0
-7*v^-1 = 13/2 // : -7
v^-1 = -13/14
-1 < 0
1/(v^1) = -13/14 // * v^1
1 = -13/14*v^1 // : -13/14
-14/13 = v^1
v = -14/13
v = -14/13
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