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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
v-(7/v)-3 = v+6/v+1+7 // - v+6/v+1+7
v-v-(7/v)-(6/v)-7-3-1 = 0
v-v-7*v^-1-6*v^-1-7-3-1 = 0
-13*v^-1 = 11 // : -13
v^-1 = -11/13
-1 < 0
1/(v^1) = -11/13 // * v^1
1 = -11/13*v^1 // : -11/13
-13/11 = v^1
v = -13/11
v = -13/11
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