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