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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)
(v+4)/(v-6)+(5*v+7)/(v-6) = 0
v+5*v+4+7 = 0
6*v+11 = 0
(6*v+11)/(v-6) = 0
(6*v+11)/(v-6) = 0 // * v-6
6*v+11 = 0
6*v+11 = 0 // - 11
6*v = -11 // : 6
v = -11/6
v = -11/6
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