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